LA: simplify iterative solver stop criteria by merging Indeterminate+Running into Continue state

src/Numerics/LinearAlgebra/Complex/Solvers/BiCgStab.cs

@@ -91,20 +91,6 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers
             residual.Add(b, residual);
         }
 
-        /// <summary>
-        /// Determine if calculation should continue
-        /// </summary>
-        /// <param name="iterationNumber">Number of iterations passed</param>
-        /// <param name="result">Result <see cref="Vector"/>.</param>
-        /// <param name="source">Source <see cref="Vector"/>.</param>
-        /// <param name="residuals">Residual <see cref="Vector"/>.</param>
-        /// <returns><c>true</c> if continue, otherwise <c>false</c></returns>
-        static bool ShouldContinue(Iterator<Complex> iterator, int iterationNumber, Vector<Complex> result, Vector<Complex> source, Vector<Complex> residuals)
-        {
-            var status = iterator.DetermineStatus(iterationNumber, result, source, residuals);
-            return status == IterationStatus.Running || status == IterationStatus.Indetermined;
-        }
-
         /// <summary>
         /// Solves the matrix equation Ax = b, where A is the coefficient matrix, b is the
         /// solution vector and x is the unknown vector.
@@ -170,7 +156,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers
             Complex omega = 0;
 
             var iterationNumber = 0;
-            while (ShouldContinue(iterator, iterationNumber, result, input, residuals))
+            while (iterator.DetermineStatus(iterationNumber, result, input, residuals) == IterationStatus.Continue)
             {
                 // rho_(i-1) = r~^T r_(i-1) // dotproduct r~ and r_(i-1)
                 var oldRho = currentRho;
@@ -229,7 +215,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers
                 temp2.CopyTo(temp);
 
                 // Check convergence and stop if we are converged.
-                if (!ShouldContinue(iterator, iterationNumber, temp, input, vecS))
+                if (iterator.DetermineStatus(iterationNumber, temp, input, vecS) != IterationStatus.Continue)
                 {
                     temp.CopyTo(result);
 
@@ -237,7 +223,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers
                     CalculateTrueResidual(matrix, residuals, result, input);
 
                     // Now recheck the convergence
-                    if (!ShouldContinue(iterator, iterationNumber, result, input, residuals))
+                    if (iterator.DetermineStatus(iterationNumber, result, input, residuals) != IterationStatus.Continue)
                     {
                         // We're all good now.
                         return;
@@ -278,7 +264,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers
                     throw new Exception("Iterative solver experience a numerical break down");
                 }
 
-                if (!ShouldContinue(iterator, iterationNumber, result, input, residuals))
+                if (iterator.DetermineStatus(iterationNumber, result, input, residuals) != IterationStatus.Continue)
                 {
                     // Recalculate the residuals and go round again. This is done to ensure that
                     // we have the proper residuals.

src/Numerics/LinearAlgebra/Complex/Solvers/GpBiCg.cs

@@ -137,20 +137,6 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers
             residual.Add(b, residual);
         }
 
-        /// <summary>
-        /// Determine if calculation should continue
-        /// </summary>
-        /// <param name="iterationNumber">Number of iterations passed</param>
-        /// <param name="result">Result <see cref="Vector"/>.</param>
-        /// <param name="source">Source <see cref="Vector"/>.</param>
-        /// <param name="residuals">Residual <see cref="Vector"/>.</param>
-        /// <returns><c>true</c> if continue, otherwise <c>false</c></returns>
-        static bool ShouldContinue(Iterator<Complex> iterator, int iterationNumber, Vector<Complex> result, Vector<Complex> source, Vector<Complex> residuals)
-        {
-            var status = iterator.DetermineStatus(iterationNumber, result, source, residuals);
-            return status == IterationStatus.Running || status == IterationStatus.Indetermined;
-        }
-
         /// <summary>
         /// Decide if to do steps with BiCgStab
         /// </summary>
@@ -238,7 +224,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers
 
             // for (k = 0, 1, .... )
             var iterationNumber = 0;
-            while (ShouldContinue(iterator, iterationNumber, xtemp, input, residuals))
+            while (iterator.DetermineStatus(iterationNumber, xtemp, input, residuals) == IterationStatus.Continue)
             {
                 // p_k = r_k + beta_(k-1) * (p_(k-1) - u_(k-1))
                 p.Subtract(u, temp);
@@ -379,7 +365,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers
                 preconditioner.Approximate(xtemp, result);
 
                 // Now check for convergence
-                if (!ShouldContinue(iterator, iterationNumber, result, input, residuals))
+                if (iterator.DetermineStatus(iterationNumber, result, input, residuals) != IterationStatus.Continue)
                 {
                     // Recalculate the residuals and go round again. This is done to ensure that
                     // we have the proper residuals.

src/Numerics/LinearAlgebra/Complex/Solvers/MlkBiCgStab.cs

@@ -240,20 +240,6 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers
             residual.Add(b, residual);
         }
 
-        /// <summary>
-        /// Determine if calculation should continue
-        /// </summary>
-        /// <param name="iterationNumber">Number of iterations passed</param>
-        /// <param name="result">Result <see cref="Vector"/>.</param>
-        /// <param name="source">Source <see cref="Vector"/>.</param>
-        /// <param name="residuals">Residual <see cref="Vector"/>.</param>
-        /// <returns><c>true</c> if continue, otherwise <c>false</c></returns>
-        static bool ShouldContinue(Iterator<Complex> iterator, int iterationNumber, Vector<Complex> result, Vector<Complex> source, Vector<Complex> residuals)
-        {
-            var status = iterator.DetermineStatus(iterationNumber, result, source, residuals);
-            return status == IterationStatus.Running || status == IterationStatus.Indetermined;
-        }
-
         /// <summary>
         /// Solves the matrix equation Ax = b, where A is the coefficient matrix, b is the
         /// solution vector and x is the unknown vector.
@@ -347,7 +333,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers
 
             // FOR (j = 0, 1, 2 ....)
             var iterationNumber = 0;
-            while (ShouldContinue(iterator, iterationNumber, xtemp, input, residuals))
+            while (iterator.DetermineStatus(iterationNumber, xtemp, input, residuals) == IterationStatus.Continue)
             {
                 // SOLVE M g~_((j-1)k+k) = g_((j-1)k+k)
                 preconditioner.Approximate(g[k - 1], gtemp);
@@ -405,13 +391,13 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers
                 temp2.CopyTo(xtemp);
 
                 // Check convergence and stop if we are converged.
-                if (!ShouldContinue(iterator, iterationNumber, xtemp, input, residuals))
+                if (iterator.DetermineStatus(iterationNumber, xtemp, input, residuals) != IterationStatus.Continue)
                 {
                     // Calculate the true residual
                     CalculateTrueResidual(matrix, residuals, xtemp, input);
 
                     // Now recheck the convergence
-                    if (!ShouldContinue(iterator, iterationNumber, xtemp, input, residuals))
+                    if (iterator.DetermineStatus(iterationNumber, xtemp, input, residuals) != IterationStatus.Continue)
                     {
                         // We're all good now.
                         // Exit from the while loop.
@@ -540,7 +526,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers
                         temp2.CopyTo(residuals);
 
                         // We can check the residuals here if they're close
-                        if (!ShouldContinue(iterator, iterationNumber, xtemp, input, residuals))
+                        if (iterator.DetermineStatus(iterationNumber, xtemp, input, residuals) != IterationStatus.Continue)
                         {
                             // Recalculate the residuals and go round again. This is done to ensure that
                             // we have the proper residuals.

src/Numerics/LinearAlgebra/Complex/Solvers/StopCriterium/DivergenceStopCriterium.cs

@@ -77,7 +77,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers.StopCriterium
         /// <summary>
         /// The status of the calculation
         /// </summary>
-        IterationStatus _status = IterationStatus.Indetermined;
+        IterationStatus _status = IterationStatus.Continue;
 
         /// <summary>
         /// The array that holds the tracking information.
@@ -257,7 +257,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers.StopCriterium
             }
 
             // Check if we are diverging and if so set the status
-            _status = IsDiverging() ? IterationStatus.Diverged : IterationStatus.Running;
+            _status = IsDiverging() ? IterationStatus.Diverged : IterationStatus.Continue;
 
             _lastIteration = iterationNumber;
             return _status;
@@ -318,7 +318,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers.StopCriterium
         /// </summary>
         public void Reset()
         {
-            _status = IterationStatus.Indetermined;
+            _status = IterationStatus.Continue;
             _lastIteration = DefaultLastIterationNumber;
             _residualHistory = null;
         }

src/Numerics/LinearAlgebra/Complex/Solvers/StopCriterium/FailureStopCriterium.cs

@@ -56,7 +56,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers.StopCriterium
         /// <summary>
         /// The status of the calculation
         /// </summary>
-        IterationStatus _status = IterationStatus.Indetermined;
+        IterationStatus _status = IterationStatus.Continue;
 
         /// <summary>
         /// The iteration number of the last iteration.
@@ -99,7 +99,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers.StopCriterium
             var residualNorm = residualVector.InfinityNorm();
             var solutionNorm = solutionVector.InfinityNorm();
 
-            _status = double.IsNaN(solutionNorm.Real) || double.IsNaN(residualNorm.Real) ? IterationStatus.Failure : IterationStatus.Running;
+            _status = double.IsNaN(solutionNorm.Real) || double.IsNaN(residualNorm.Real) ? IterationStatus.Failure : IterationStatus.Continue;
 
             _lastIteration = iterationNumber;
             return _status;
@@ -122,7 +122,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers.StopCriterium
         /// </summary>
         public void Reset()
         {
-            _status = IterationStatus.Indetermined;
+            _status = IterationStatus.Continue;
             _lastIteration = DefaultLastIterationNumber;
         }
 

src/Numerics/LinearAlgebra/Complex/Solvers/StopCriterium/ResidualStopCriterium.cs

@@ -76,7 +76,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers.StopCriterium
         /// <summary>
         /// The status of the calculation
         /// </summary>
-        IterationStatus _status = IterationStatus.Indetermined;
+        IterationStatus _status = IterationStatus.Continue;
 
         /// <summary>
         /// The number of iterations since the residuals got below the maximum.
@@ -267,13 +267,13 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers.StopCriterium
                 if (_lastIteration <= iterationNumber)
                 {
                     _iterationCount = iterationNumber - _lastIteration;
-                    _status = _iterationCount >= _minimumIterationsBelowMaximum ? IterationStatus.Converged : IterationStatus.Running;
+                    _status = _iterationCount >= _minimumIterationsBelowMaximum ? IterationStatus.Converged : IterationStatus.Continue;
                 }
             }
             else
             {
                 _iterationCount = 0;
-                _status = IterationStatus.Running;
+                _status = IterationStatus.Continue;
             }
 
             _lastIteration = iterationNumber;
@@ -313,7 +313,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers.StopCriterium
         /// </summary>
         public void Reset()
         {
-            _status = IterationStatus.Indetermined;
+            _status = IterationStatus.Continue;
             _iterationCount = 0;
             _lastIteration = DefaultLastIterationNumber;
         }

src/Numerics/LinearAlgebra/Complex/Solvers/TFQMR.cs

@@ -78,20 +78,6 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers
             residual.Add(b, residual);
         }
 
-        /// <summary>
-        /// Determine if calculation should continue
-        /// </summary>
-        /// <param name="iterationNumber">Number of iterations passed</param>
-        /// <param name="result">Result <see cref="Vector"/>.</param>
-        /// <param name="source">Source <see cref="Vector"/>.</param>
-        /// <param name="residuals">Residual <see cref="Vector"/>.</param>
-        /// <returns><c>true</c> if continue, otherwise <c>false</c></returns>
-        static bool ShouldContinue(Iterator<Complex> iterator, int iterationNumber, Vector<Complex> result, Vector<Complex> source, Vector<Complex> residuals)
-        {
-            var status = iterator.DetermineStatus(iterationNumber, result, source, residuals);
-            return status == IterationStatus.Running || status == IterationStatus.Indetermined;
-        }
-
         /// <summary>
         /// Is <paramref name="number"/> even?
         /// </summary>
@@ -174,7 +160,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers
 
             // Start the iteration
             var iterationNumber = 0;
-            while (ShouldContinue(iterator, iterationNumber, result, input, pseudoResiduals))
+            while (iterator.DetermineStatus(iterationNumber, result, input, pseudoResiduals) == IterationStatus.Continue)
             {
                 // First part of the step, the even bit
                 if (IsEven(iterationNumber))
@@ -233,7 +219,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers
                 temp2.CopyTo(x);
 
                 // Check convergence and see if we can bail
-                if (!ShouldContinue(iterator, iterationNumber, result, input, pseudoResiduals))
+                if (iterator.DetermineStatus(iterationNumber, result, input, pseudoResiduals) != IterationStatus.Continue)
                 {
                     // Calculate the real values
                     preconditioner.Approximate(x, result);
@@ -244,7 +230,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex.Solvers
                     CalculateTrueResidual(matrix, temp, result, input);
 
                     // Now recheck the convergence
-                    if (!ShouldContinue(iterator, iterationNumber, result, input, temp))
+                    if (iterator.DetermineStatus(iterationNumber, result, input, temp) != IterationStatus.Continue)
                     {
                         // We're all good now.
                         return;

src/Numerics/LinearAlgebra/Complex32/Solvers/BiCgStab.cs

@@ -29,7 +29,6 @@
 // </copyright>
 
 using System;
-using MathNet.Numerics.LinearAlgebra.Complex32.Solvers.Preconditioners;
 using MathNet.Numerics.LinearAlgebra.Solvers;
 using MathNet.Numerics.Properties;
 
@@ -85,20 +84,6 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers
             residual.Add(b, residual);
         }
 
-        /// <summary>
-        /// Determine if calculation should continue
-        /// </summary>
-        /// <param name="iterationNumber">Number of iterations passed</param>
-        /// <param name="result">Result <see cref="Vector"/>.</param>
-        /// <param name="source">Source <see cref="Vector"/>.</param>
-        /// <param name="residuals">Residual <see cref="Vector"/>.</param>
-        /// <returns><c>true</c> if continue, otherwise <c>false</c></returns>
-        static bool ShouldContinue(Iterator<Numerics.Complex32> iterator, int iterationNumber, Vector<Numerics.Complex32> result, Vector<Numerics.Complex32> source, Vector<Numerics.Complex32> residuals)
-        {
-            var status = iterator.DetermineStatus(iterationNumber, result, source, residuals);
-            return status == IterationStatus.Running || status == IterationStatus.Indetermined;
-        }
-
         /// <summary>
         /// Solves the matrix equation Ax = b, where A is the coefficient matrix, b is the
         /// solution vector and x is the unknown vector.
@@ -164,7 +149,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers
             Numerics.Complex32 omega = 0;
 
             var iterationNumber = 0;
-            while (ShouldContinue(iterator, iterationNumber, result, input, residuals))
+            while (iterator.DetermineStatus(iterationNumber, result, input, residuals) == IterationStatus.Continue)
             {
                 // rho_(i-1) = r~^T r_(i-1) // dotproduct r~ and r_(i-1)
                 var oldRho = currentRho;
@@ -223,7 +208,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers
                 temp2.CopyTo(temp);
 
                 // Check convergence and stop if we are converged.
-                if (!ShouldContinue(iterator, iterationNumber, temp, input, vecS))
+                if (iterator.DetermineStatus(iterationNumber, temp, input, vecS) != IterationStatus.Continue)
                 {
                     temp.CopyTo(result);
 
@@ -231,7 +216,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers
                     CalculateTrueResidual(matrix, residuals, result, input);
 
                     // Now recheck the convergence
-                    if (!ShouldContinue(iterator, iterationNumber, result, input, residuals))
+                    if (iterator.DetermineStatus(iterationNumber, result, input, residuals) != IterationStatus.Continue)
                     {
                         // We're all good now.
                         return;
@@ -272,7 +257,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers
                     throw new Exception("Iterative solver experience a numerical break down");
                 }
 
-                if (!ShouldContinue(iterator, iterationNumber, result, input, residuals))
+                if (iterator.DetermineStatus(iterationNumber, result, input, residuals) != IterationStatus.Continue)
                 {
                     // Recalculate the residuals and go round again. This is done to ensure that
                     // we have the proper residuals.

src/Numerics/LinearAlgebra/Complex32/Solvers/GpBiCg.cs

@@ -130,20 +130,6 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers
             residual.Add(b, residual);
         }
 
-        /// <summary>
-        /// Determine if calculation should continue
-        /// </summary>
-        /// <param name="iterationNumber">Number of iterations passed</param>
-        /// <param name="result">Result <see cref="Vector"/>.</param>
-        /// <param name="source">Source <see cref="Vector"/>.</param>
-        /// <param name="residuals">Residual <see cref="Vector"/>.</param>
-        /// <returns><c>true</c> if continue, otherwise <c>false</c></returns>
-        static bool ShouldContinue(Iterator<Numerics.Complex32> iterator, int iterationNumber, Vector<Numerics.Complex32> result, Vector<Numerics.Complex32> source, Vector<Numerics.Complex32> residuals)
-        {
-            var status = iterator.DetermineStatus(iterationNumber, result, source, residuals);
-            return status == IterationStatus.Running || status == IterationStatus.Indetermined;
-        }
-
         /// <summary>
         /// Decide if to do steps with BiCgStab
         /// </summary>
@@ -236,7 +222,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers
 
             // for (k = 0, 1, .... )
             var iterationNumber = 0;
-            while (ShouldContinue(iterator, iterationNumber, xtemp, input, residuals))
+            while (iterator.DetermineStatus(iterationNumber, xtemp, input, residuals) == IterationStatus.Continue)
             {
                 // p_k = r_k + beta_(k-1) * (p_(k-1) - u_(k-1))
                 p.Subtract(u, temp);
@@ -377,7 +363,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers
                 preconditioner.Approximate(xtemp, result);
 
                 // Now check for convergence
-                if (!ShouldContinue(iterator, iterationNumber, result, input, residuals))
+                if (iterator.DetermineStatus(iterationNumber, result, input, residuals) != IterationStatus.Continue)
                 {
                     // Recalculate the residuals and go round again. This is done to ensure that
                     // we have the proper residuals.

src/Numerics/LinearAlgebra/Complex32/Solvers/MlkBiCgStab.cs

@@ -233,20 +233,6 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers
             residual.Add(b, residual);
         }
 
-        /// <summary>
-        /// Determine if calculation should continue
-        /// </summary>
-        /// <param name="iterationNumber">Number of iterations passed</param>
-        /// <param name="result">Result <see cref="Vector"/>.</param>
-        /// <param name="source">Source <see cref="Vector"/>.</param>
-        /// <param name="residuals">Residual <see cref="Vector"/>.</param>
-        /// <returns><c>true</c> if continue, otherwise <c>false</c></returns>
-        static bool ShouldContinue(Iterator<Numerics.Complex32> iterator, int iterationNumber, Vector<Numerics.Complex32> result, Vector<Numerics.Complex32> source, Vector<Numerics.Complex32> residuals)
-        {
-            var status = iterator.DetermineStatus(iterationNumber, result, source, residuals);
-            return status == IterationStatus.Running || status == IterationStatus.Indetermined;
-        }
-
         /// <summary>
         /// Solves the matrix equation Ax = b, where A is the coefficient matrix, b is the
         /// solution vector and x is the unknown vector.
@@ -345,7 +331,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers
 
             // FOR (j = 0, 1, 2 ....)
             var iterationNumber = 0;
-            while (ShouldContinue(iterator, iterationNumber, xtemp, input, residuals))
+            while (iterator.DetermineStatus(iterationNumber, xtemp, input, residuals) == IterationStatus.Continue)
             {
                 // SOLVE M g~_((j-1)k+k) = g_((j-1)k+k)
                 preconditioner.Approximate(g[k - 1], gtemp);
@@ -403,13 +389,13 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers
                 temp2.CopyTo(xtemp);
 
                 // Check convergence and stop if we are converged.
-                if (!ShouldContinue(iterator, iterationNumber, xtemp, input, residuals))
+                if (iterator.DetermineStatus(iterationNumber, xtemp, input, residuals) != IterationStatus.Continue)
                 {
                     // Calculate the true residual
                     CalculateTrueResidual(matrix, residuals, xtemp, input);
 
                     // Now recheck the convergence
-                    if (!ShouldContinue(iterator, iterationNumber, xtemp, input, residuals))
+                    if (iterator.DetermineStatus(iterationNumber, xtemp, input, residuals) != IterationStatus.Continue)
                     {
                         // We're all good now.
                         // Exit from the while loop.
@@ -538,7 +524,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers
                         temp2.CopyTo(residuals);
 
                         // We can check the residuals here if they're close
-                        if (!ShouldContinue(iterator, iterationNumber, xtemp, input, residuals))
+                        if (iterator.DetermineStatus(iterationNumber, xtemp, input, residuals) != IterationStatus.Continue)
                         {
                             // Recalculate the residuals and go round again. This is done to ensure that
                             // we have the proper residuals.

src/Numerics/LinearAlgebra/Complex32/Solvers/StopCriterium/DivergenceStopCriterium.cs

@@ -72,7 +72,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers.StopCriterium
         /// <summary>
         /// The status of the calculation
         /// </summary>
-        IterationStatus _status = IterationStatus.Indetermined;
+        IterationStatus _status = IterationStatus.Continue;
 
         /// <summary>
         /// The array that holds the tracking information.
@@ -252,7 +252,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers.StopCriterium
             }
 
             // Check if we are diverging and if so set the status
-            _status = IsDiverging() ? IterationStatus.Diverged : IterationStatus.Running;
+            _status = IsDiverging() ? IterationStatus.Diverged : IterationStatus.Continue;
 
             _lastIteration = iterationNumber;
             return _status;
@@ -313,7 +313,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers.StopCriterium
         /// </summary>
         public void Reset()
         {
-            _status = IterationStatus.Indetermined;
+            _status = IterationStatus.Continue;
             _lastIteration = DefaultLastIterationNumber;
             _residualHistory = null;
         }

src/Numerics/LinearAlgebra/Complex32/Solvers/StopCriterium/FailureStopCriterium.cs

@@ -51,7 +51,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers.StopCriterium
         /// <summary>
         /// The status of the calculation
         /// </summary>
-        IterationStatus _status = IterationStatus.Indetermined;
+        IterationStatus _status = IterationStatus.Continue;
 
         /// <summary>
         /// The iteration number of the last iteration.
@@ -94,7 +94,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers.StopCriterium
             var residualNorm = residualVector.InfinityNorm();
             var solutionNorm = solutionVector.InfinityNorm();
 
-            _status = float.IsNaN(solutionNorm.Real) || float.IsNaN(residualNorm.Real) ? IterationStatus.Failure : IterationStatus.Running;
+            _status = float.IsNaN(solutionNorm.Real) || float.IsNaN(residualNorm.Real) ? IterationStatus.Failure : IterationStatus.Continue;
 
             _lastIteration = iterationNumber;
             return _status;
@@ -117,7 +117,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers.StopCriterium
         /// </summary>
         public void Reset()
         {
-            _status = IterationStatus.Indetermined;
+            _status = IterationStatus.Continue;
             _lastIteration = DefaultLastIterationNumber;
         }
 

src/Numerics/LinearAlgebra/Complex32/Solvers/StopCriterium/ResidualStopCriterium.cs

@@ -71,7 +71,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers.StopCriterium
         /// <summary>
         /// The status of the calculation
         /// </summary>
-        IterationStatus _status = IterationStatus.Indetermined;
+        IterationStatus _status = IterationStatus.Continue;
 
         /// <summary>
         /// The number of iterations since the residuals got below the maximum.
@@ -262,13 +262,13 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers.StopCriterium
                 if (_lastIteration <= iterationNumber)
                 {
                     _iterationCount = iterationNumber - _lastIteration;
-                    _status = _iterationCount >= _minimumIterationsBelowMaximum ? IterationStatus.Converged : IterationStatus.Running;
+                    _status = _iterationCount >= _minimumIterationsBelowMaximum ? IterationStatus.Converged : IterationStatus.Continue;
                 }
             }
             else
             {
                 _iterationCount = 0;
-                _status = IterationStatus.Running;
+                _status = IterationStatus.Continue;
             }
 
             _lastIteration = iterationNumber;
@@ -308,7 +308,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers.StopCriterium
         /// </summary>
         public void Reset()
         {
-            _status = IterationStatus.Indetermined;
+            _status = IterationStatus.Continue;
             _iterationCount = 0;
             _lastIteration = DefaultLastIterationNumber;
         }

src/Numerics/LinearAlgebra/Complex32/Solvers/TFQMR.cs

@@ -70,20 +70,6 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers
             residual.Add(b, residual);
         }
 
-        /// <summary>
-        /// Determine if calculation should continue
-        /// </summary>
-        /// <param name="iterationNumber">Number of iterations passed</param>
-        /// <param name="result">Result <see cref="Vector"/>.</param>
-        /// <param name="source">Source <see cref="Vector"/>.</param>
-        /// <param name="residuals">Residual <see cref="Vector"/>.</param>
-        /// <returns><c>true</c> if continue, otherwise <c>false</c></returns>
-        static bool ShouldContinue(Iterator<Numerics.Complex32> iterator, int iterationNumber, Vector<Numerics.Complex32> result, Vector<Numerics.Complex32> source, Vector<Numerics.Complex32> residuals)
-        {
-            var status = iterator.DetermineStatus(iterationNumber, result, source, residuals);
-            return status == IterationStatus.Running || status == IterationStatus.Indetermined;
-        }
-
         /// <summary>
         /// Is <paramref name="number"/> even?
         /// </summary>
@@ -171,7 +157,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers
 
             // Start the iteration
             var iterationNumber = 0;
-            while (ShouldContinue(iterator, iterationNumber, result, input, pseudoResiduals))
+            while (iterator.DetermineStatus(iterationNumber, result, input, pseudoResiduals) == IterationStatus.Continue)
             {
                 // First part of the step, the even bit
                 if (IsEven(iterationNumber))
@@ -230,7 +216,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers
                 temp2.CopyTo(x);
 
                 // Check convergence and see if we can bail
-                if (!ShouldContinue(iterator, iterationNumber, result, input, pseudoResiduals))
+                if (iterator.DetermineStatus(iterationNumber, result, input, pseudoResiduals) != IterationStatus.Continue)
                 {
                     // Calculate the real values
                     preconditioner.Approximate(x, result);
@@ -241,7 +227,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32.Solvers
                     CalculateTrueResidual(matrix, temp, result, input);
 
                     // Now recheck the convergence
-                    if (!ShouldContinue(iterator, iterationNumber, result, input, temp))
+                    if (iterator.DetermineStatus(iterationNumber, result, input, temp) != IterationStatus.Continue)
                     {
                         // We're all good now.
                         return;

src/Numerics/LinearAlgebra/Double/Solvers/BiCgStab.cs

@@ -84,20 +84,6 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers
             residual.Add(b, residual);
         }
 
-        /// <summary>
-        /// Determine if calculation should continue
-        /// </summary>
-        /// <param name="iterationNumber">Number of iterations passed</param>
-        /// <param name="result">Result <see cref="Vector"/>.</param>
-        /// <param name="source">Source <see cref="Vector"/>.</param>
-        /// <param name="residuals">Residual <see cref="Vector"/>.</param>
-        /// <returns><c>true</c> if continue, otherwise <c>false</c></returns>
-        static bool ShouldContinue(Iterator<double> iterator, int iterationNumber, Vector<double> result, Vector<double> source, Vector<double> residuals)
-        {
-            var status = iterator.DetermineStatus(iterationNumber, result, source, residuals);
-            return status == IterationStatus.Running || status == IterationStatus.Indetermined;
-        }
-
         /// <summary>
         /// Solves the matrix equation Ax = b, where A is the coefficient matrix, b is the
         /// solution vector and x is the unknown vector.
@@ -163,7 +149,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers
             double omega = 0;
 
             var iterationNumber = 0;
-            while (ShouldContinue(iterator, iterationNumber, result, input, residuals))
+            while (iterator.DetermineStatus(iterationNumber, result, input, residuals) == IterationStatus.Continue)
             {
                 // rho_(i-1) = r~^T r_(i-1) // dotproduct r~ and r_(i-1)
                 var oldRho = currentRho;
@@ -222,7 +208,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers
                 temp2.CopyTo(temp);
 
                 // Check convergence and stop if we are converged.
-                if (!ShouldContinue(iterator, iterationNumber, temp, input, vecS))
+                if (iterator.DetermineStatus(iterationNumber, temp, input, vecS) != IterationStatus.Continue)
                 {
                     temp.CopyTo(result);
 
@@ -230,7 +216,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers
                     CalculateTrueResidual(matrix, residuals, result, input);
 
                     // Now recheck the convergence
-                    if (!ShouldContinue(iterator, iterationNumber, result, input, residuals))
+                    if (iterator.DetermineStatus(iterationNumber, result, input, residuals) != IterationStatus.Continue)
                     {
                         // We're all good now.
                         return;
@@ -271,7 +257,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers
                     throw new Exception("Iterative solver experience a numerical break down");
                 }
 
-                if (!ShouldContinue(iterator, iterationNumber, result, input, residuals))
+                if (iterator.DetermineStatus(iterationNumber, result, input, residuals) != IterationStatus.Continue)
                 {
                     // Recalculate the residuals and go round again. This is done to ensure that
                     // we have the proper residuals.

src/Numerics/LinearAlgebra/Double/Solvers/GpBiCg.cs

@@ -136,20 +136,6 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers
             residual.Add(b, residual);
         }
 
-        /// <summary>
-        /// Determine if calculation should continue
-        /// </summary>
-        /// <param name="iterationNumber">Number of iterations passed</param>
-        /// <param name="result">Result <see cref="Vector"/>.</param>
-        /// <param name="source">Source <see cref="Vector"/>.</param>
-        /// <param name="residuals">Residual <see cref="Vector"/>.</param>
-        /// <returns><c>true</c> if continue, otherwise <c>false</c></returns>
-        static bool ShouldContinue(Iterator<double> iterator, int iterationNumber, Vector<double> result, Vector<double> source, Vector<double> residuals)
-        {
-            var status = iterator.DetermineStatus(iterationNumber, result, source, residuals);
-            return status == IterationStatus.Running || status == IterationStatus.Indetermined;
-        }
-
         /// <summary>
         /// Decide if to do steps with BiCgStab
         /// </summary>
@@ -242,7 +228,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers
 
             // for (k = 0, 1, .... )
             var iterationNumber = 0;
-            while (ShouldContinue(iterator, iterationNumber, xtemp, input, residuals))
+            while (iterator.DetermineStatus(iterationNumber, xtemp, input, residuals) == IterationStatus.Continue)
             {
                 // p_k = r_k + beta_(k-1) * (p_(k-1) - u_(k-1))
                 p.Subtract(u, temp);
@@ -383,7 +369,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers
                 preconditioner.Approximate(xtemp, result);
 
                 // Now check for convergence
-                if (!ShouldContinue(iterator, iterationNumber, result, input, residuals))
+                if (iterator.DetermineStatus(iterationNumber, result, input, residuals) != IterationStatus.Continue)
                 {
                     // Recalculate the residuals and go round again. This is done to ensure that
                     // we have the proper residuals.

src/Numerics/LinearAlgebra/Double/Solvers/MlkBiCgStab.cs

@@ -233,20 +233,6 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers
             residual.Add(b, residual);
         }
 
-        /// <summary>
-        /// Determine if calculation should continue
-        /// </summary>
-        /// <param name="iterationNumber">Number of iterations passed</param>
-        /// <param name="result">Result <see cref="Vector"/>.</param>
-        /// <param name="source">Source <see cref="Vector"/>.</param>
-        /// <param name="residuals">Residual <see cref="Vector"/>.</param>
-        /// <returns><c>true</c> if continue, otherwise <c>false</c></returns>
-        static bool ShouldContinue(Iterator<double> iterator, int iterationNumber, Vector<double> result, Vector<double> source, Vector<double> residuals)
-        {
-            var status = iterator.DetermineStatus(iterationNumber, result, source, residuals);
-            return status == IterationStatus.Running || status == IterationStatus.Indetermined;
-        }
-
         /// <summary>
         /// Solves the matrix equation Ax = b, where A is the coefficient matrix, b is the
         /// solution vector and x is the unknown vector.
@@ -345,7 +331,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers
 
             // FOR (j = 0, 1, 2 ....)
             var iterationNumber = 0;
-            while (ShouldContinue(iterator, iterationNumber, xtemp, input, residuals))
+            while (iterator.DetermineStatus(iterationNumber, xtemp, input, residuals) == IterationStatus.Continue)
             {
                 // SOLVE M g~_((j-1)k+k) = g_((j-1)k+k)
                 preconditioner.Approximate(g[k - 1], gtemp);
@@ -403,13 +389,13 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers
                 temp2.CopyTo(xtemp);
 
                 // Check convergence and stop if we are converged.
-                if (!ShouldContinue(iterator, iterationNumber, xtemp, input, residuals))
+                if (iterator.DetermineStatus(iterationNumber, xtemp, input, residuals) != IterationStatus.Continue)
                 {
                     // Calculate the true residual
                     CalculateTrueResidual(matrix, residuals, xtemp, input);
 
                     // Now recheck the convergence
-                    if (!ShouldContinue(iterator, iterationNumber, xtemp, input, residuals))
+                    if (iterator.DetermineStatus(iterationNumber, xtemp, input, residuals) != IterationStatus.Continue)
                     {
                         // We're all good now.
                         // Exit from the while loop.
@@ -538,7 +524,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers
                         temp2.CopyTo(residuals);
 
                         // We can check the residuals here if they're close
-                        if (!ShouldContinue(iterator, iterationNumber, xtemp, input, residuals))
+                        if (iterator.DetermineStatus(iterationNumber, xtemp, input, residuals) != IterationStatus.Continue)
                         {
                             // Recalculate the residuals and go round again. This is done to ensure that
                             // we have the proper residuals.

src/Numerics/LinearAlgebra/Double/Solvers/StopCriterium/DivergenceStopCriterium.cs

@@ -44,7 +44,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers.StopCriterium
         /// residual may experience before a divergence warning is issued.
         /// </summary>
         public const double DefaultMaximumRelativeIncrease = 0.08;
-        
+
         /// <summary>
         /// Default value for the minimum number of iterations over which 
         /// the residual must grow before a divergence warning is issued.
@@ -55,32 +55,32 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers.StopCriterium
         /// Defines the default last iteration number. Set to -1 because iterations normally
         /// start at 0.
         /// </summary>
-        private const int DefaultLastIterationNumber = -1;
+        const int DefaultLastIterationNumber = -1;
 
         /// <summary>
         /// The maximum relative increase the residual may experience without triggering a divergence warning.
         /// </summary>
-        private double _maximumRelativeIncrease;
+        double _maximumRelativeIncrease;
 
         /// <summary>
         /// The number of iterations over which a residual increase should be tracked before issuing a divergence warning.
         /// </summary>
-        private int _minimumNumberOfIterations;
+        int _minimumNumberOfIterations;
 
         /// <summary>
         /// The status of the calculation
         /// </summary>
-        private IterationStatus _status = IterationStatus.Indetermined;
+        IterationStatus _status = IterationStatus.Continue;
 
         /// <summary>
         /// The array that holds the tracking information.
         /// </summary>
-        private double[] _residualHistory;
+        double[] _residualHistory;
 
         /// <summary>
         /// The iteration number of the last iteration.
         /// </summary>
-        private int _lastIteration = DefaultLastIterationNumber;
+        int _lastIteration = DefaultLastIterationNumber;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="DivergenceStopCriterium"/> class with the default maximum 
@@ -104,7 +104,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers.StopCriterium
         /// relative increase and the specified minimum number of tracking iterations.
         /// </summary>
         /// <param name="minimumIterations">The minimum number of iterations over which the residual must grow before a divergence warning is issued. </param>
-        public DivergenceStopCriterium(int minimumIterations) : this(DefaultMinimumNumberOfIterations,  minimumIterations)
+        public DivergenceStopCriterium(int minimumIterations) : this(DefaultMinimumNumberOfIterations, minimumIterations)
         {
         }
 
@@ -250,7 +250,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers.StopCriterium
             }
 
             // Check if we are diverging and if so set the status
-            _status = IsDiverging() ? IterationStatus.Diverged : IterationStatus.Running;
+            _status = IsDiverging() ? IterationStatus.Diverged : IterationStatus.Continue;
 
             _lastIteration = iterationNumber;
             return _status;
@@ -260,7 +260,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers.StopCriterium
         /// Detect if solution is diverging
         /// </summary>
         /// <returns><c>true</c> if diverging, otherwise <c>false</c></returns>
-        private bool IsDiverging()
+        bool IsDiverging()
         {
             // Run for each variable
             for (var i = 1; i < _residualHistory.Length; i++)
@@ -270,7 +270,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers.StopCriterium
                 // Divergence is occurring if:
                 // - the last residual is larger than the previous one
                 // - the relative increase of the residual is larger than the setting allows
-                if ((difference < 0) || (_residualHistory[i - 1] * (1 + _maximumRelativeIncrease) >= _residualHistory[i]))
+                if ((difference < 0) || (_residualHistory[i - 1]*(1 + _maximumRelativeIncrease) >= _residualHistory[i]))
                 {
                     // No divergence taking place within the required number of iterations
                     // So reset and stop the iteration. There is no way we can get to the
@@ -285,7 +285,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers.StopCriterium
         /// <summary>
         /// Gets required history Length
         /// </summary>
-        private int RequiredHistoryLength
+        int RequiredHistoryLength
         {
             [DebuggerStepThrough]
             get
@@ -311,7 +311,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers.StopCriterium
         /// </summary>
         public void Reset()
         {
-            _status = IterationStatus.Indetermined;
+            _status = IterationStatus.Continue;
             _lastIteration = DefaultLastIterationNumber;
             _residualHistory = null;
         }
@@ -325,4 +325,4 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers.StopCriterium
             return new DivergenceStopCriterium(_maximumRelativeIncrease, _minimumNumberOfIterations);
         }
     }
-}
+}

src/Numerics/LinearAlgebra/Double/Solvers/StopCriterium/FailureStopCriterium.cs

@@ -49,7 +49,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers.StopCriterium
         /// <summary>
         /// The status of the calculation
         /// </summary>
-        IterationStatus _status = IterationStatus.Indetermined;
+        IterationStatus _status = IterationStatus.Continue;
 
         /// <summary>
         /// The iteration number of the last iteration.
@@ -92,7 +92,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers.StopCriterium
             var residualNorm = residualVector.InfinityNorm();
             var solutionNorm = solutionVector.InfinityNorm();
 
-            _status = double.IsNaN(solutionNorm) || double.IsNaN(residualNorm) ? IterationStatus.Failure : IterationStatus.Running;
+            _status = double.IsNaN(solutionNorm) || double.IsNaN(residualNorm) ? IterationStatus.Failure : IterationStatus.Continue;
 
             _lastIteration = iterationNumber;
             return _status;
@@ -115,7 +115,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers.StopCriterium
         /// </summary>
         public void Reset()
         {
-            _status = IterationStatus.Indetermined;
+            _status = IterationStatus.Continue;
             _lastIteration = DefaultLastIterationNumber;
         }
 

src/Numerics/LinearAlgebra/Double/Solvers/StopCriterium/ResidualStopCriterium.cs

@@ -69,7 +69,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers.StopCriterium
         /// <summary>
         /// The status of the calculation
         /// </summary>
-        IterationStatus _status = IterationStatus.Indetermined;
+        IterationStatus _status = IterationStatus.Continue;
 
         /// <summary>
         /// The number of iterations since the residuals got below the maximum.
@@ -260,13 +260,13 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers.StopCriterium
                 if (_lastIteration <= iterationNumber)
                 {
                     _iterationCount = iterationNumber - _lastIteration;
-                    _status = _iterationCount >= _minimumIterationsBelowMaximum ? IterationStatus.Converged : IterationStatus.Running;
+                    _status = _iterationCount >= _minimumIterationsBelowMaximum ? IterationStatus.Converged : IterationStatus.Continue;
                 }
             }
             else
             {
                 _iterationCount = 0;
-                _status = IterationStatus.Running;
+                _status = IterationStatus.Continue;
             }
 
             _lastIteration = iterationNumber;
@@ -306,7 +306,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers.StopCriterium
         /// </summary>
         public void Reset()
         {
-            _status = IterationStatus.Indetermined;
+            _status = IterationStatus.Continue;
             _iterationCount = 0;
             _lastIteration = DefaultLastIterationNumber;
         }

src/Numerics/LinearAlgebra/Double/Solvers/TFQMR.cs

@@ -70,20 +70,6 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers
             residual.Add(b, residual);
         }
 
-        /// <summary>
-        /// Determine if calculation should continue
-        /// </summary>
-        /// <param name="iterationNumber">Number of iterations passed</param>
-        /// <param name="result">Result <see cref="Vector"/>.</param>
-        /// <param name="source">Source <see cref="Vector"/>.</param>
-        /// <param name="residuals">Residual <see cref="Vector"/>.</param>
-        /// <returns><c>true</c> if continue, otherwise <c>false</c></returns>
-        static bool ShouldContinue(Iterator<double> iterator, int iterationNumber, Vector<double> result, Vector<double> source, Vector<double> residuals)
-        {
-            var status = iterator.DetermineStatus(iterationNumber, result, source, residuals);
-            return status == IterationStatus.Running || status == IterationStatus.Indetermined;
-        }
-
         /// <summary>
         /// Is <paramref name="number"/> even?
         /// </summary>
@@ -171,7 +157,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers
 
             // Start the iteration
             var iterationNumber = 0;
-            while (ShouldContinue(iterator, iterationNumber, result, input, pseudoResiduals))
+            while (iterator.DetermineStatus(iterationNumber, result, input, pseudoResiduals) == IterationStatus.Continue)
             {
                 // First part of the step, the even bit
                 if (IsEven(iterationNumber))
@@ -230,7 +216,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers
                 temp2.CopyTo(x);
 
                 // Check convergence and see if we can bail
-                if (!ShouldContinue(iterator, iterationNumber, result, input, pseudoResiduals))
+                if (iterator.DetermineStatus(iterationNumber, result, input, pseudoResiduals) != IterationStatus.Continue)
                 {
                     // Calculate the real values
                     preconditioner.Approximate(x, result);
@@ -241,7 +227,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double.Solvers
                     CalculateTrueResidual(matrix, temp, result, input);
 
                     // Now recheck the convergence
-                    if (!ShouldContinue(iterator, iterationNumber, result, input, temp))
+                    if (iterator.DetermineStatus(iterationNumber, result, input, temp) != IterationStatus.Continue)
                     {
                         // We're all good now.
                         return;

src/Numerics/LinearAlgebra/Single/Solvers/BiCgStab.cs

@@ -84,20 +84,6 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers
             residual.Add(b, residual);
         }
 
-        /// <summary>
-        /// Determine if calculation should continue
-        /// </summary>
-        /// <param name="iterationNumber">Number of iterations passed</param>
-        /// <param name="result">Result <see cref="Vector"/>.</param>
-        /// <param name="source">Source <see cref="Vector"/>.</param>
-        /// <param name="residuals">Residual <see cref="Vector"/>.</param>
-        /// <returns><c>true</c> if continue, otherwise <c>false</c></returns>
-        static bool ShouldContinue(Iterator<float> iterator, int iterationNumber, Vector<float> result, Vector<float> source, Vector<float> residuals)
-        {
-            var status = iterator.DetermineStatus(iterationNumber, result, source, residuals);
-            return status == IterationStatus.Running || status == IterationStatus.Indetermined;
-        }
-
         /// <summary>
         /// Solves the matrix equation Ax = b, where A is the coefficient matrix, b is the
         /// solution vector and x is the unknown vector.
@@ -163,7 +149,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers
             float omega = 0;
 
             var iterationNumber = 0;
-            while (ShouldContinue(iterator, iterationNumber, result, input, residuals))
+            while (iterator.DetermineStatus(iterationNumber, result, input, residuals) == IterationStatus.Continue)
             {
                 // rho_(i-1) = r~^T r_(i-1) // dotproduct r~ and r_(i-1)
                 var oldRho = currentRho;
@@ -222,7 +208,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers
                 temp2.CopyTo(temp);
 
                 // Check convergence and stop if we are converged.
-                if (!ShouldContinue(iterator, iterationNumber, temp, input, vecS))
+                if (iterator.DetermineStatus(iterationNumber, temp, input, vecS) != IterationStatus.Continue)
                 {
                     temp.CopyTo(result);
 
@@ -230,7 +216,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers
                     CalculateTrueResidual(matrix, residuals, result, input);
 
                     // Now recheck the convergence
-                    if (!ShouldContinue(iterator, iterationNumber, result, input, residuals))
+                    if (iterator.DetermineStatus(iterationNumber, result, input, residuals) != IterationStatus.Continue)
                     {
                         // We're all good now.
                         return;
@@ -271,7 +257,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers
                     throw new Exception("Iterative solver experience a numerical break down");
                 }
 
-                if (!ShouldContinue(iterator, iterationNumber, result, input, residuals))
+                if (iterator.DetermineStatus(iterationNumber, result, input, residuals) != IterationStatus.Continue)
                 {
                     // Recalculate the residuals and go round again. This is done to ensure that
                     // we have the proper residuals.

src/Numerics/LinearAlgebra/Single/Solvers/GpBiCg.cs

@@ -130,20 +130,6 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers
             residual.Add(b, residual);
         }
 
-        /// <summary>
-        /// Determine if calculation should continue
-        /// </summary>
-        /// <param name="iterationNumber">Number of iterations passed</param>
-        /// <param name="result">Result <see cref="Vector"/>.</param>
-        /// <param name="source">Source <see cref="Vector"/>.</param>
-        /// <param name="residuals">Residual <see cref="Vector"/>.</param>
-        /// <returns><c>true</c> if continue, otherwise <c>false</c></returns>
-        static bool ShouldContinue(Iterator<float> iterator, int iterationNumber, Vector<float> result, Vector<float> source, Vector<float> residuals)
-        {
-            var status = iterator.DetermineStatus(iterationNumber, result, source, residuals);
-            return status == IterationStatus.Running || status == IterationStatus.Indetermined;
-        }
-
         /// <summary>
         /// Decide if to do steps with BiCgStab
         /// </summary>
@@ -236,7 +222,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers
 
             // for (k = 0, 1, .... )
             var iterationNumber = 0;
-            while (ShouldContinue(iterator, iterationNumber, xtemp, input, residuals))
+            while (iterator.DetermineStatus(iterationNumber, xtemp, input, residuals) == IterationStatus.Continue)
             {
                 // p_k = r_k + beta_(k-1) * (p_(k-1) - u_(k-1))
                 p.Subtract(u, temp);
@@ -377,7 +363,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers
                 preconditioner.Approximate(xtemp, result);
 
                 // Now check for convergence
-                if (!ShouldContinue(iterator, iterationNumber, result, input, residuals))
+                if (iterator.DetermineStatus(iterationNumber, result, input, residuals) != IterationStatus.Continue)
                 {
                     // Recalculate the residuals and go round again. This is done to ensure that
                     // we have the proper residuals.

src/Numerics/LinearAlgebra/Single/Solvers/MlkBiCgStab.cs

@@ -236,20 +236,6 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers
             residual.Add(b, residual);
         }
 
-        /// <summary>
-        /// Determine if calculation should continue
-        /// </summary>
-        /// <param name="iterationNumber">Number of iterations passed</param>
-        /// <param name="result">Result <see cref="Vector"/>.</param>
-        /// <param name="source">Source <see cref="Vector"/>.</param>
-        /// <param name="residuals">Residual <see cref="Vector"/>.</param>
-        /// <returns><c>true</c> if continue, otherwise <c>false</c></returns>
-        static bool ShouldContinue(Iterator<float> iterator, int iterationNumber, Vector<float> result, Vector<float> source, Vector<float> residuals)
-        {
-            var status = iterator.DetermineStatus(iterationNumber, result, source, residuals);
-            return status == IterationStatus.Running || status == IterationStatus.Indetermined;
-        }
-
         /// <summary>
         /// Solves the matrix equation Ax = b, where A is the coefficient matrix, b is the
         /// solution vector and x is the unknown vector.
@@ -348,7 +334,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers
 
             // FOR (j = 0, 1, 2 ....)
             var iterationNumber = 0;
-            while (ShouldContinue(iterator, iterationNumber, xtemp, input, residuals))
+            while (iterator.DetermineStatus(iterationNumber, xtemp, input, residuals) == IterationStatus.Continue)
             {
                 // SOLVE M g~_((j-1)k+k) = g_((j-1)k+k)
                 preconditioner.Approximate(g[k - 1], gtemp);
@@ -406,13 +392,13 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers
                 temp2.CopyTo(xtemp);
 
                 // Check convergence and stop if we are converged.
-                if (!ShouldContinue(iterator, iterationNumber, xtemp, input, residuals))
+                if (iterator.DetermineStatus(iterationNumber, xtemp, input, residuals) != IterationStatus.Continue)
                 {
                     // Calculate the true residual
                     CalculateTrueResidual(matrix, residuals, xtemp, input);
 
                     // Now recheck the convergence
-                    if (!ShouldContinue(iterator, iterationNumber, xtemp, input, residuals))
+                    if (iterator.DetermineStatus(iterationNumber, xtemp, input, residuals) != IterationStatus.Continue)
                     {
                         // We're all good now.
                         // Exit from the while loop.
@@ -541,7 +527,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers
                         temp2.CopyTo(residuals);
 
                         // We can check the residuals here if they're close
-                        if (!ShouldContinue(iterator, iterationNumber, xtemp, input, residuals))
+                        if (iterator.DetermineStatus(iterationNumber, xtemp, input, residuals) != IterationStatus.Continue)
                         {
                             // Recalculate the residuals and go round again. This is done to ensure that
                             // we have the proper residuals.

src/Numerics/LinearAlgebra/Single/Solvers/StopCriterium/DivergenceStopCriterium.cs

@@ -44,7 +44,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers.StopCriterium
         /// residual may experience before a divergence warning is issued.
         /// </summary>
         public const double DefaultMaximumRelativeIncrease = 0.08;
-        
+
         /// <summary>
         /// Default value for the minimum number of iterations over which 
         /// the residual must grow before a divergence warning is issued.
@@ -55,32 +55,32 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers.StopCriterium
         /// Defines the default last iteration number. Set to -1 because iterations normally
         /// start at 0.
         /// </summary>
-        private const int DefaultLastIterationNumber = -1;
+        const int DefaultLastIterationNumber = -1;
 
         /// <summary>
         /// The maximum relative increase the residual may experience without triggering a divergence warning.
         /// </summary>
-        private double _maximumRelativeIncrease;
+        double _maximumRelativeIncrease;
 
         /// <summary>
         /// The number of iterations over which a residual increase should be tracked before issuing a divergence warning.
         /// </summary>
-        private int _minimumNumberOfIterations;
+        int _minimumNumberOfIterations;
 
         /// <summary>
         /// The status of the calculation
         /// </summary>
-        private IterationStatus _status = IterationStatus.Indetermined;
+        IterationStatus _status = IterationStatus.Continue;
 
         /// <summary>
         /// The array that holds the tracking information.
         /// </summary>
-        private double[] _residualHistory;
+        double[] _residualHistory;
 
         /// <summary>
         /// The iteration number of the last iteration.
         /// </summary>
-        private int _lastIteration = DefaultLastIterationNumber;
+        int _lastIteration = DefaultLastIterationNumber;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="DivergenceStopCriterium"/> class with the default maximum 
@@ -104,7 +104,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers.StopCriterium
         /// relative increase and the specified minimum number of tracking iterations.
         /// </summary>
         /// <param name="minimumIterations">The minimum number of iterations over which the residual must grow before a divergence warning is issued. </param>
-        public DivergenceStopCriterium(int minimumIterations) : this(DefaultMinimumNumberOfIterations,  minimumIterations)
+        public DivergenceStopCriterium(int minimumIterations) : this(DefaultMinimumNumberOfIterations, minimumIterations)
         {
         }
 
@@ -250,7 +250,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers.StopCriterium
             }
 
             // Check if we are diverging and if so set the status
-            _status = IsDiverging() ? IterationStatus.Diverged : IterationStatus.Running;
+            _status = IsDiverging() ? IterationStatus.Diverged : IterationStatus.Continue;
 
             _lastIteration = iterationNumber;
             return _status;
@@ -260,7 +260,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers.StopCriterium
         /// Detect if solution is diverging
         /// </summary>
         /// <returns><c>true</c> if diverging, otherwise <c>false</c></returns>
-        private bool IsDiverging()
+        bool IsDiverging()
         {
             // Run for each variable
             for (var i = 1; i < _residualHistory.Length; i++)
@@ -270,7 +270,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers.StopCriterium
                 // Divergence is occurring if:
                 // - the last residual is larger than the previous one
                 // - the relative increase of the residual is larger than the setting allows
-                if ((difference < 0) || (_residualHistory[i - 1] * (1 + _maximumRelativeIncrease) >= _residualHistory[i]))
+                if ((difference < 0) || (_residualHistory[i - 1]*(1 + _maximumRelativeIncrease) >= _residualHistory[i]))
                 {
                     // No divergence taking place within the required number of iterations
                     // So reset and stop the iteration. There is no way we can get to the
@@ -285,7 +285,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers.StopCriterium
         /// <summary>
         /// Gets required history Length
         /// </summary>
-        private int RequiredHistoryLength
+        int RequiredHistoryLength
         {
             [DebuggerStepThrough]
             get
@@ -311,7 +311,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers.StopCriterium
         /// </summary>
         public void Reset()
         {
-            _status = IterationStatus.Indetermined;
+            _status = IterationStatus.Continue;
             _lastIteration = DefaultLastIterationNumber;
             _residualHistory = null;
         }

src/Numerics/LinearAlgebra/Single/Solvers/StopCriterium/FailureStopCriterium.cs

@@ -44,17 +44,17 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers.StopCriterium
         /// Defines the default last iteration number. Set to -1 because iterations normally
         /// start at 0.
         /// </summary>
-        private const int DefaultLastIterationNumber = -1;
+        const int DefaultLastIterationNumber = -1;
 
         /// <summary>
         /// The status of the calculation
         /// </summary>
-        private IterationStatus _status = IterationStatus.Indetermined;
+        IterationStatus _status = IterationStatus.Continue;
 
         /// <summary>
         /// The iteration number of the last iteration.
         /// </summary>
-        private int _lastIteration = DefaultLastIterationNumber;
+        int _lastIteration = DefaultLastIterationNumber;
 
         /// <summary>
         /// Determines the status of the iterative calculation based on the stop criteria stored
@@ -92,7 +92,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers.StopCriterium
             var residualNorm = residualVector.InfinityNorm();
             var solutionNorm = solutionVector.InfinityNorm();
 
-            _status = float.IsNaN(solutionNorm) || float.IsNaN(residualNorm) ? IterationStatus.Failure : IterationStatus.Running;
+            _status = float.IsNaN(solutionNorm) || float.IsNaN(residualNorm) ? IterationStatus.Failure : IterationStatus.Continue;
 
             _lastIteration = iterationNumber;
             return _status;
@@ -115,7 +115,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers.StopCriterium
         /// </summary>
         public void Reset()
         {
-            _status = IterationStatus.Indetermined;
+            _status = IterationStatus.Continue;
             _lastIteration = DefaultLastIterationNumber;
         }
 

src/Numerics/LinearAlgebra/Single/Solvers/StopCriterium/ResidualStopCriterium.cs

@@ -69,7 +69,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers.StopCriterium
         /// <summary>
         /// The status of the calculation
         /// </summary>
-        IterationStatus _status = IterationStatus.Indetermined;
+        IterationStatus _status = IterationStatus.Continue;
 
         /// <summary>
         /// The number of iterations since the residuals got below the maximum.
@@ -260,13 +260,13 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers.StopCriterium
                 if (_lastIteration <= iterationNumber)
                 {
                     _iterationCount = iterationNumber - _lastIteration;
-                    _status = _iterationCount >= _minimumIterationsBelowMaximum ? IterationStatus.Converged : IterationStatus.Running;
+                    _status = _iterationCount >= _minimumIterationsBelowMaximum ? IterationStatus.Converged : IterationStatus.Continue;
                 }
             }
             else
             {
                 _iterationCount = 0;
-                _status = IterationStatus.Running;
+                _status = IterationStatus.Continue;
             }
 
             _lastIteration = iterationNumber;
@@ -306,7 +306,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers.StopCriterium
         /// </summary>
         public void Reset()
         {
-            _status = IterationStatus.Indetermined;
+            _status = IterationStatus.Continue;
             _iterationCount = 0;
             _lastIteration = DefaultLastIterationNumber;
         }

src/Numerics/LinearAlgebra/Single/Solvers/TFQMR.cs

@@ -70,20 +70,6 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers
             residual.Add(b, residual);
         }
 
-        /// <summary>
-        /// Determine if calculation should continue
-        /// </summary>
-        /// <param name="iterationNumber">Number of iterations passed</param>
-        /// <param name="result">Result <see cref="Vector"/>.</param>
-        /// <param name="source">Source <see cref="Vector"/>.</param>
-        /// <param name="residuals">Residual <see cref="Vector"/>.</param>
-        /// <returns><c>true</c> if continue, otherwise <c>false</c></returns>
-        static bool ShouldContinue(Iterator<float> iterator, int iterationNumber, Vector<float> result, Vector<float> source, Vector<float> residuals)
-        {
-            var status = iterator.DetermineStatus(iterationNumber, result, source, residuals);
-            return status == IterationStatus.Running || status == IterationStatus.Indetermined;
-        }
-
         /// <summary>
         /// Is <paramref name="number"/> even?
         /// </summary>
@@ -171,7 +157,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers
 
             // Start the iteration
             var iterationNumber = 0;
-            while (ShouldContinue(iterator, iterationNumber, result, input, pseudoResiduals))
+            while (iterator.DetermineStatus(iterationNumber, result, input, pseudoResiduals) == IterationStatus.Continue)
             {
                 // First part of the step, the even bit
                 if (IsEven(iterationNumber))
@@ -230,7 +216,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers
                 temp2.CopyTo(x);
 
                 // Check convergence and see if we can bail
-                if (!ShouldContinue(iterator, iterationNumber, result, input, pseudoResiduals))
+                if (iterator.DetermineStatus(iterationNumber, result, input, pseudoResiduals) != IterationStatus.Continue)
                 {
                     // Calculate the real values
                     preconditioner.Approximate(x, result);
@@ -241,7 +227,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single.Solvers
                     CalculateTrueResidual(matrix, temp, result, input);
 
                     // Now recheck the convergence
-                    if (!ShouldContinue(iterator, iterationNumber, result, input, temp))
+                    if (iterator.DetermineStatus(iterationNumber, result, input, temp) != IterationStatus.Continue)
                     {
                         // We're all good now.
                         return;

src/Numerics/LinearAlgebra/Solvers/CancellationStopCriterium.cs

@@ -75,7 +75,7 @@ namespace MathNet.Numerics.LinearAlgebra.Solvers
         /// </remarks>
         public IterationStatus DetermineStatus(int iterationNumber, Vector<T> solutionVector, Vector<T> sourceVector, Vector<T> residualVector)
         {
-            return _currentTcs.Token.IsCancellationRequested ? IterationStatus.Cancelled : IterationStatus.Running;
+            return _currentTcs.Token.IsCancellationRequested ? IterationStatus.Cancelled : IterationStatus.Continue;
         }
 
         /// <summary>
@@ -86,7 +86,7 @@ namespace MathNet.Numerics.LinearAlgebra.Solvers
             [DebuggerStepThrough]
             get
             {
-                return _currentTcs.Token.IsCancellationRequested ? IterationStatus.Cancelled : IterationStatus.Running;
+                return _currentTcs.Token.IsCancellationRequested ? IterationStatus.Cancelled : IterationStatus.Continue;
             }
         }
 

src/Numerics/LinearAlgebra/Solvers/IterationCountStopCriterium.cs

@@ -53,7 +53,7 @@ namespace MathNet.Numerics.LinearAlgebra.Solvers
         /// <summary>
         /// The status of the calculation
         /// </summary>
-        IterationStatus _status = IterationStatus.Indetermined;
+        IterationStatus _status = IterationStatus.Continue;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="IterationCountStopCriterium{T}"/> class with the default maximum 
@@ -130,7 +130,7 @@ namespace MathNet.Numerics.LinearAlgebra.Solvers
                 throw new ArgumentOutOfRangeException("iterationNumber");
             }
 
-            _status = iterationNumber >= _maximumNumberOfIterations ? IterationStatus.StoppedWithoutConvergence : IterationStatus.Running;
+            _status = iterationNumber >= _maximumNumberOfIterations ? IterationStatus.StoppedWithoutConvergence : IterationStatus.Continue;
 
             return _status;
         }
@@ -152,7 +152,7 @@ namespace MathNet.Numerics.LinearAlgebra.Solvers
         /// </summary>
         public void Reset()
         {
-            _status = IterationStatus.Indetermined;
+            _status = IterationStatus.Continue;
         }
 
         /// <summary>

src/Numerics/LinearAlgebra/Solvers/IterationStatus.cs

@@ -35,8 +35,7 @@ namespace MathNet.Numerics.LinearAlgebra.Solvers
     /// </summary>
     public enum IterationStatus
     {
-        Indetermined = 0,
-        Running,
+        Continue = 0,
         Converged,
         Diverged,
         StoppedWithoutConvergence,

src/Numerics/LinearAlgebra/Solvers/Iterator.cs

@@ -49,7 +49,7 @@ namespace MathNet.Numerics.LinearAlgebra.Solvers
         /// <summary>
         /// The status of the iterator.
         /// </summary>
-        IterationStatus _status = IterationStatus.Indetermined;
+        IterationStatus _status = IterationStatus.Continue;
 
         /// <summary>
         /// Initializes a new instance of the <see cref="Iterator{T}"/> class with the specified stop criteria.
@@ -133,13 +133,7 @@ namespace MathNet.Numerics.LinearAlgebra.Solvers
             foreach (var stopCriterium in _stopCriteria)
             {
                 var status = stopCriterium.DetermineStatus(iterationNumber, solutionVector, sourceVector, residualVector);
-
-                // Check if the status is:
-                // - Running --> keep going
-                // - Indetermined --> keep going
-                // Anything else:
-                // Stop looping and set that status
-                if ((status == IterationStatus.Running) || (status == IterationStatus.Indetermined))
+                if (status == IterationStatus.Continue)
                 {
                     continue;
                 }
@@ -150,7 +144,7 @@ namespace MathNet.Numerics.LinearAlgebra.Solvers
 
             // Got all the way through
             // So we're running because we had vectors passed to us.
-            _status = IterationStatus.Running;
+            _status = IterationStatus.Continue;
 
             return _status;
         }
@@ -171,7 +165,7 @@ namespace MathNet.Numerics.LinearAlgebra.Solvers
         /// </summary>
         public void Reset()
         {
-            _status = IterationStatus.Indetermined;
+            _status = IterationStatus.Continue;
 
             foreach (var stopCriterium in _stopCriteria)
             {

src/UnitTests/LinearAlgebraTests/Complex/Solvers/IteratorTest.cs

@@ -102,7 +102,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex.Solvers
                 DenseVector.Create(3, i => 4),
                 DenseVector.Create(3, i => 4),
                 DenseVector.Create(3, i => 4));
-            Assert.AreEqual(IterationStatus.Running, iterator.Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, iterator.Status, "Incorrect status");
 
             // Second step, should run out of iterations.
             iterator.DetermineStatus(
@@ -134,13 +134,13 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex.Solvers
                 DenseVector.Create(3, i => 4),
                 DenseVector.Create(3, i => 4),
                 DenseVector.Create(3, i => 4));
-            Assert.AreEqual(IterationStatus.Running, iterator.Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, iterator.Status, "Incorrect status");
 
             iterator.Reset();
-            Assert.AreEqual(IterationStatus.Indetermined, iterator.Status, "Incorrect status");
-            Assert.AreEqual(IterationStatus.Indetermined, criteria[0].Status, "Incorrect status");
-            Assert.AreEqual(IterationStatus.Indetermined, criteria[1].Status, "Incorrect status");
-            Assert.AreEqual(IterationStatus.Indetermined, criteria[2].Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, iterator.Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, criteria[0].Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, criteria[1].Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, criteria[2].Status, "Incorrect status");
         }
     }
 }

src/UnitTests/LinearAlgebraTests/Complex/Solvers/StopCriterium/DivergenceStopCriteriumTest.cs

@@ -139,7 +139,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex.Solvers.StopCrit
                     new DenseVector(new[] {new Complex(1.0, 0)}),
                     new DenseVector(new[] {new Complex((i + 1)*(Increase + 0.1), 0)}));
 
-                Assert.AreEqual(IterationStatus.Running, status, "Status check fail.");
+                Assert.AreEqual(IterationStatus.Continue, status, "Status check fail.");
             }
         }
 
@@ -163,7 +163,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex.Solvers.StopCrit
                     new DenseVector(new[] {new Complex(1.0, 0)}),
                     new DenseVector(new[] {new Complex((i + 1)*(Increase - 0.01), 0)}));
 
-                Assert.AreEqual(IterationStatus.Running, status, "Status check fail.");
+                Assert.AreEqual(IterationStatus.Continue, status, "Status check fail.");
             }
         }
 
@@ -187,7 +187,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex.Solvers.StopCrit
                     new DenseVector(new[] {new Complex(1.0, 0)}),
                     new DenseVector(new[] {new Complex((i + 1)*(Increase - 0.01), 0)}));
 
-                Assert.AreEqual(IterationStatus.Running, status, "Status check fail.");
+                Assert.AreEqual(IterationStatus.Continue, status, "Status check fail.");
             }
 
             // Now make it fail by throwing in a NaN
@@ -222,7 +222,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex.Solvers.StopCrit
                     new DenseVector(new[] {new Complex(1.0, 0)}),
                     new DenseVector(new[] {new Complex(previous, 0)}));
 
-                Assert.AreEqual(IterationStatus.Running, status, "Status check fail.");
+                Assert.AreEqual(IterationStatus.Continue, status, "Status check fail.");
             }
 
             // Add the final residual. Now we should have divergence
@@ -261,7 +261,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex.Solvers.StopCrit
 
             Assert.AreEqual(Increase, criterium.MaximumRelativeIncrease, "Incorrect maximum");
             Assert.AreEqual(Iterations, criterium.MinimumNumberOfIterations, "Incorrect iteration count");
-            Assert.AreEqual(IterationStatus.Indetermined, criterium.Status, "Status check fail.");
+            Assert.AreEqual(IterationStatus.Continue, criterium.Status, "Status check fail.");
         }
 
         /// <summary>
@@ -282,11 +282,8 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex.Solvers.StopCrit
             var clonedCriterium = clone as DivergenceStopCriterium;
             Assert.IsNotNull(clonedCriterium);
 
-            // ReSharper disable PossibleNullReferenceException
             Assert.AreEqual(criterium.MaximumRelativeIncrease, clonedCriterium.MaximumRelativeIncrease, "Incorrect maximum");
             Assert.AreEqual(criterium.MinimumNumberOfIterations, clonedCriterium.MinimumNumberOfIterations, "Incorrect iteration count");
-
-            // ReSharper restore PossibleNullReferenceException
         }
     }
 }

src/UnitTests/LinearAlgebraTests/Complex/Solvers/StopCriterium/FailureStopCriteriumTest.cs

@@ -126,7 +126,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex.Solvers.StopCrit
             var residual = new DenseVector(new[] {new Complex(1.0, 0), new Complex(2.0, 0), new Complex(3, 0)});
 
             var status = criterium.DetermineStatus(5, solution, source, residual);
-            Assert.AreEqual(IterationStatus.Running, status, "Should be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should be running");
         }
 
         /// <summary>
@@ -143,10 +143,10 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex.Solvers.StopCrit
             var residual = new DenseVector(new[] {new Complex(1000, 0), new Complex(1000, 0), new Complex(2001, 0)});
 
             var status = criterium.DetermineStatus(5, solution, source, residual);
-            Assert.AreEqual(IterationStatus.Running, status, "Should be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should be running");
 
             criterium.Reset();
-            Assert.AreEqual(IterationStatus.Indetermined, criterium.Status, "Should not have started");
+            Assert.AreEqual(IterationStatus.Continue, criterium.Status, "Should not have started");
         }
 
         /// <summary>

src/UnitTests/LinearAlgebraTests/Complex/Solvers/StopCriterium/IterationCountStopCriteriumTest.cs

@@ -99,7 +99,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex.Solvers.StopCrit
             Assert.IsNotNull(criterium, "A criterium should have been created");
 
             var status = criterium.DetermineStatus(5, DenseVector.Create(3, i => 1), DenseVector.Create(3, i => 2), DenseVector.Create(3, i => 3));
-            Assert.AreEqual(IterationStatus.Running, status, "Should be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should be running");
 
             var status2 = criterium.DetermineStatus(10, DenseVector.Create(3, i => 1), DenseVector.Create(3, i => 2), DenseVector.Create(3, i => 3));
             Assert.AreEqual(IterationStatus.StoppedWithoutConvergence, status2, "Should be finished");
@@ -115,10 +115,10 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex.Solvers.StopCrit
             Assert.IsNotNull(criterium, "A criterium should have been created");
 
             var status = criterium.DetermineStatus(5, DenseVector.Create(3, i => 1), DenseVector.Create(3, i => 2), DenseVector.Create(3, i => 3));
-            Assert.AreEqual(IterationStatus.Running, status, "Should be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should be running");
 
             criterium.Reset();
-            Assert.AreEqual(IterationStatus.Indetermined, criterium.Status, "Should not have started");
+            Assert.AreEqual(IterationStatus.Continue, criterium.Status, "Should not have started");
         }
 
         /// <summary>

src/UnitTests/LinearAlgebraTests/Complex/Solvers/StopCriterium/ResidualStopCriteriumTest.cs

@@ -239,7 +239,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex.Solvers.StopCrit
             var residual = new DenseVector(new[] {new Complex(0.001, 0), new Complex(0.001, 0), new Complex(0.002, 0)});
 
             var status = criterium.DetermineStatus(5, solution, source, residual);
-            Assert.AreEqual(IterationStatus.Running, status, "Should still be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should still be running");
 
             var status2 = criterium.DetermineStatus(16, solution, source, residual);
             Assert.AreEqual(IterationStatus.Converged, status2, "Should be done");
@@ -259,10 +259,10 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex.Solvers.StopCrit
             var residual = new DenseVector(new[] {new Complex(1.000, 0), new Complex(1.000, 0), new Complex(2.001, 0)});
 
             var status = criterium.DetermineStatus(5, solution, source, residual);
-            Assert.AreEqual(IterationStatus.Running, status, "Should be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should be running");
 
             criterium.Reset();
-            Assert.AreEqual(IterationStatus.Indetermined, criterium.Status, "Should not have started");
+            Assert.AreEqual(IterationStatus.Continue, criterium.Status, "Should not have started");
         }
 
         /// <summary>

src/UnitTests/LinearAlgebraTests/Complex32/Solvers/IteratorTest.cs

@@ -102,7 +102,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex32.Solvers
                 DenseVector.Create(3, i => 4),
                 DenseVector.Create(3, i => 4),
                 DenseVector.Create(3, i => 4));
-            Assert.AreEqual(IterationStatus.Running, iterator.Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, iterator.Status, "Incorrect status");
 
             // Second step, should run out of iterations.
             iterator.DetermineStatus(
@@ -134,13 +134,13 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex32.Solvers
                 DenseVector.Create(3, i => 4),
                 DenseVector.Create(3, i => 4),
                 DenseVector.Create(3, i => 4));
-            Assert.AreEqual(IterationStatus.Running, iterator.Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, iterator.Status, "Incorrect status");
 
             iterator.Reset();
-            Assert.AreEqual(IterationStatus.Indetermined, iterator.Status, "Incorrect status");
-            Assert.AreEqual(IterationStatus.Indetermined, criteria[0].Status, "Incorrect status");
-            Assert.AreEqual(IterationStatus.Indetermined, criteria[1].Status, "Incorrect status");
-            Assert.AreEqual(IterationStatus.Indetermined, criteria[2].Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, iterator.Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, criteria[0].Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, criteria[1].Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, criteria[2].Status, "Incorrect status");
         }
     }
 }

src/UnitTests/LinearAlgebraTests/Complex32/Solvers/StopCriterium/DivergenceStopCriteriumTest.cs

@@ -138,7 +138,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex32.Solvers.StopCr
                     new DenseVector(new[] {new Complex32(1.0f, 0)}),
                     new DenseVector(new[] {new Complex32(1.0f, 0)}),
                     new DenseVector(new[] {new Complex32((i + 1)*(Increase + 0.1f), 0)}));
-                Assert.AreEqual(IterationStatus.Running, status, "Status check fail.");
+                Assert.AreEqual(IterationStatus.Continue, status, "Status check fail.");
             }
         }
 
@@ -162,7 +162,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex32.Solvers.StopCr
                     new DenseVector(new[] {new Complex32(1.0f, 0)}),
                     new DenseVector(new[] {new Complex32((i + 1)*(Increase - 0.01f), 0)}));
 
-                Assert.AreEqual(IterationStatus.Running, status, "Status check fail.");
+                Assert.AreEqual(IterationStatus.Continue, status, "Status check fail.");
             }
         }
 
@@ -186,7 +186,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex32.Solvers.StopCr
                     new DenseVector(new[] {new Complex32(1.0f, 0)}),
                     new DenseVector(new[] {new Complex32((i + 1)*(Increase - 0.01f), 0)}));
 
-                Assert.AreEqual(IterationStatus.Running, status, "Status check fail.");
+                Assert.AreEqual(IterationStatus.Continue, status, "Status check fail.");
             }
 
             // Now make it fail by throwing in a NaN
@@ -221,7 +221,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex32.Solvers.StopCr
                     new DenseVector(new[] {new Complex32(1.0f, 0)}),
                     new DenseVector(new[] {new Complex32(previous, 0)}));
 
-                Assert.AreEqual(IterationStatus.Running, status, "Status check fail.");
+                Assert.AreEqual(IterationStatus.Continue, status, "Status check fail.");
             }
 
             // Add the final residual. Now we should have divergence
@@ -260,7 +260,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex32.Solvers.StopCr
 
             Assert.AreEqual(Increase, criterium.MaximumRelativeIncrease, "Incorrect maximum");
             Assert.AreEqual(Iterations, criterium.MinimumNumberOfIterations, "Incorrect iteration count");
-            Assert.AreEqual(IterationStatus.Indetermined, criterium.Status, "Status check fail.");
+            Assert.AreEqual(IterationStatus.Continue, criterium.Status, "Status check fail.");
         }
 
         /// <summary>
@@ -281,11 +281,8 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex32.Solvers.StopCr
             var clonedCriterium = clone as DivergenceStopCriterium;
             Assert.IsNotNull(clonedCriterium);
 
-            // ReSharper disable PossibleNullReferenceException
             Assert.AreEqual(criterium.MaximumRelativeIncrease, clonedCriterium.MaximumRelativeIncrease, "Incorrect maximum");
             Assert.AreEqual(criterium.MinimumNumberOfIterations, clonedCriterium.MinimumNumberOfIterations, "Incorrect iteration count");
-
-            // ReSharper restore PossibleNullReferenceException
         }
     }
 }

src/UnitTests/LinearAlgebraTests/Complex32/Solvers/StopCriterium/FailureStopCriteriumTest.cs

@@ -126,7 +126,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex32.Solvers.StopCr
             var residual = new DenseVector(new[] {new Complex32(1.0f, 0), new Complex32(2.0f, 0), new Complex32(3, 0)});
 
             var status = criterium.DetermineStatus(5, solution, source, residual);
-            Assert.AreEqual(IterationStatus.Running, status, "Should be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should be running");
         }
 
         /// <summary>
@@ -143,10 +143,10 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex32.Solvers.StopCr
             var residual = new DenseVector(new[] {new Complex32(1000, 0), new Complex32(1000, 0), new Complex32(2001, 0)});
 
             var status = criterium.DetermineStatus(5, solution, source, residual);
-            Assert.AreEqual(IterationStatus.Running, status, "Should be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should be running");
 
             criterium.Reset();
-            Assert.AreEqual(IterationStatus.Indetermined, criterium.Status, "Should not have started");
+            Assert.AreEqual(IterationStatus.Continue, criterium.Status, "Should not have started");
         }
 
         /// <summary>

src/UnitTests/LinearAlgebraTests/Complex32/Solvers/StopCriterium/IterationCountStopCriteriumTest.cs

@@ -99,7 +99,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex32.Solvers.StopCr
             Assert.IsNotNull(criterium, "A criterium should have been created");
 
             var status = criterium.DetermineStatus(5, DenseVector.Create(3, i => 1), DenseVector.Create(3, i => 2), DenseVector.Create(3, i => 3));
-            Assert.AreEqual(IterationStatus.Running, status, "Should be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should be running");
 
             var status2 = criterium.DetermineStatus(10, DenseVector.Create(3, i => 1), DenseVector.Create(3, i => 2), DenseVector.Create(3, i => 3));
             Assert.AreEqual(IterationStatus.StoppedWithoutConvergence, status2, "Should be finished");
@@ -115,10 +115,10 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex32.Solvers.StopCr
             Assert.IsNotNull(criterium, "A criterium should have been created");
 
             var status = criterium.DetermineStatus(5, DenseVector.Create(3, i => 1), DenseVector.Create(3, i => 2), DenseVector.Create(3, i => 3));
-            Assert.AreEqual(IterationStatus.Running, status, "Should be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should be running");
 
             criterium.Reset();
-            Assert.AreEqual(IterationStatus.Indetermined, criterium.Status, "Should not have started");
+            Assert.AreEqual(IterationStatus.Continue, criterium.Status, "Should not have started");
         }
 
         /// <summary>

src/UnitTests/LinearAlgebraTests/Complex32/Solvers/StopCriterium/ResidualStopCriteriumTest.cs

@@ -239,7 +239,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex32.Solvers.StopCr
             var residual = new DenseVector(new[] {new Complex32(0.001f, 0), new Complex32(0.001f, 0), new Complex32(0.002f, 0)});
 
             var status = criterium.DetermineStatus(5, solution, source, residual);
-            Assert.AreEqual(IterationStatus.Running, status, "Should still be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should still be running");
 
             var status2 = criterium.DetermineStatus(16, solution, source, residual);
             Assert.AreEqual(IterationStatus.Converged, status2, "Should be done");
@@ -259,10 +259,10 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Complex32.Solvers.StopCr
             var residual = new DenseVector(new[] {new Complex32(1.000f, 0), new Complex32(1.000f, 0), new Complex32(2.001f, 0)});
 
             var status = criterium.DetermineStatus(5, solution, source, residual);
-            Assert.AreEqual(IterationStatus.Running, status, "Should be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should be running");
 
             criterium.Reset();
-            Assert.AreEqual(IterationStatus.Indetermined, criterium.Status, "Should not have started");
+            Assert.AreEqual(IterationStatus.Continue, criterium.Status, "Should not have started");
         }
 
         /// <summary>

src/UnitTests/LinearAlgebraTests/Double/Solvers/IteratorTest.cs

@@ -100,7 +100,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Double.Solvers
                 DenseVector.Create(3, i => 4),
                 DenseVector.Create(3, i => 4),
                 DenseVector.Create(3, i => 4));
-            Assert.AreEqual(IterationStatus.Running, iterator.Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, iterator.Status, "Incorrect status");
 
             // Second step, should run out of iterations.
             iterator.DetermineStatus(
@@ -132,13 +132,13 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Double.Solvers
                 DenseVector.Create(3, i => 4),
                 DenseVector.Create(3, i => 4),
                 DenseVector.Create(3, i => 4));
-            Assert.AreEqual(IterationStatus.Running, iterator.Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, iterator.Status, "Incorrect status");
 
             iterator.Reset();
-            Assert.AreEqual(IterationStatus.Indetermined, iterator.Status, "Incorrect status");
-            Assert.AreEqual(IterationStatus.Indetermined, criteria[0].Status, "Incorrect status");
-            Assert.AreEqual(IterationStatus.Indetermined, criteria[1].Status, "Incorrect status");
-            Assert.AreEqual(IterationStatus.Indetermined, criteria[2].Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, iterator.Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, criteria[0].Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, criteria[1].Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, criteria[2].Status, "Incorrect status");
         }
     }
 }

src/UnitTests/LinearAlgebraTests/Double/Solvers/StopCriterium/DivergenceStopCriteriumTest.cs

@@ -137,7 +137,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Double.Solvers.StopCrite
                     new DenseVector(new[] {1.0}),
                     new DenseVector(new[] {(i + 1)*(Increase + 0.1)}));
 
-                Assert.AreEqual(IterationStatus.Running, status, "Status check fail.");
+                Assert.AreEqual(IterationStatus.Continue, status, "Status check fail.");
             }
         }
 
@@ -161,7 +161,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Double.Solvers.StopCrite
                     new DenseVector(new[] {1.0}),
                     new DenseVector(new[] {(i + 1)*(Increase - 0.01)}));
 
-                Assert.AreEqual(IterationStatus.Running, status, "Status check fail.");
+                Assert.AreEqual(IterationStatus.Continue, status, "Status check fail.");
             }
         }
 
@@ -185,7 +185,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Double.Solvers.StopCrite
                     new DenseVector(new[] {1.0}),
                     new DenseVector(new[] {(i + 1)*(Increase - 0.01)}));
 
-                Assert.AreEqual(IterationStatus.Running, status, "Status check fail.");
+                Assert.AreEqual(IterationStatus.Continue, status, "Status check fail.");
             }
 
             // Now make it fail by throwing in a NaN
@@ -220,7 +220,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Double.Solvers.StopCrite
                     new DenseVector(new[] {1.0}),
                     new DenseVector(new[] {previous}));
 
-                Assert.AreEqual(IterationStatus.Running, status, "Status check fail.");
+                Assert.AreEqual(IterationStatus.Continue, status, "Status check fail.");
             }
 
             // Add the final residual. Now we should have divergence
@@ -259,7 +259,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Double.Solvers.StopCrite
 
             Assert.AreEqual(Increase, criterium.MaximumRelativeIncrease, "Incorrect maximum");
             Assert.AreEqual(Iterations, criterium.MinimumNumberOfIterations, "Incorrect iteration count");
-            Assert.AreEqual(IterationStatus.Indetermined, criterium.Status, "Status check fail.");
+            Assert.AreEqual(IterationStatus.Continue, criterium.Status, "Status check fail.");
         }
 
         /// <summary>
@@ -280,11 +280,8 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Double.Solvers.StopCrite
             var clonedCriterium = clone as DivergenceStopCriterium;
             Assert.IsNotNull(clonedCriterium);
 
-            // ReSharper disable PossibleNullReferenceException
             Assert.AreEqual(criterium.MaximumRelativeIncrease, clonedCriterium.MaximumRelativeIncrease, "Incorrect maximum");
             Assert.AreEqual(criterium.MinimumNumberOfIterations, clonedCriterium.MinimumNumberOfIterations, "Incorrect iteration count");
-
-            // ReSharper restore PossibleNullReferenceException
         }
     }
 }

src/UnitTests/LinearAlgebraTests/Double/Solvers/StopCriterium/FailureStopCriteriumTest.cs

@@ -124,7 +124,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Double.Solvers.StopCrite
             var residual = new DenseVector(new[] { 1.0, 2.0, 3.0 });
 
             var status = criterium.DetermineStatus(5, solution, source, residual);
-            Assert.AreEqual(IterationStatus.Running, status, "Should be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should be running");
         }
 
         /// <summary>
@@ -141,10 +141,10 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Double.Solvers.StopCrite
             var residual = new DenseVector(new[] { 1000.0, 1000.0, 2001.0 });
 
             var status = criterium.DetermineStatus(5, solution, source, residual);
-            Assert.AreEqual(IterationStatus.Running, status, "Should be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should be running");
 
             criterium.Reset();
-            Assert.AreEqual(IterationStatus.Indetermined, criterium.Status, "Should not have started");
+            Assert.AreEqual(IterationStatus.Continue, criterium.Status, "Should not have started");
         }
 
         /// <summary>

src/UnitTests/LinearAlgebraTests/Double/Solvers/StopCriterium/IterationCountStopCriteriumTest.cs

@@ -97,7 +97,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Double.Solvers.StopCrite
             Assert.IsNotNull(criterium, "A criterium should have been created");
 
             var status = criterium.DetermineStatus(5, DenseVector.Create(3, i => 1), DenseVector.Create(3, i => 2), DenseVector.Create(3, i => 3));
-            Assert.AreEqual(IterationStatus.Running, status, "Should be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should be running");
 
             var status2 = criterium.DetermineStatus(10, DenseVector.Create(3, i => 1), DenseVector.Create(3, i => 2), DenseVector.Create(3, i => 3));
             Assert.AreEqual(IterationStatus.StoppedWithoutConvergence, status2, "Should be finished");
@@ -113,10 +113,10 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Double.Solvers.StopCrite
             Assert.IsNotNull(criterium, "A criterium should have been created");
 
             var status = criterium.DetermineStatus(5, DenseVector.Create(3, i => 1), DenseVector.Create(3, i => 2), DenseVector.Create(3, i => 3));
-            Assert.AreEqual(IterationStatus.Running, status, "Should be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should be running");
 
             criterium.Reset();
-            Assert.AreEqual(IterationStatus.Indetermined, criterium.Status, "Should not have started");
+            Assert.AreEqual(IterationStatus.Continue, criterium.Status, "Should not have started");
         }
 
         /// <summary>

src/UnitTests/LinearAlgebraTests/Double/Solvers/StopCriterium/ResidualStopCriteriumTest.cs

@@ -233,7 +233,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Double.Solvers.StopCrite
             var residual = new DenseVector(new[] {0.001, 0.001, 0.002});
 
             var status = criterium.DetermineStatus(5, solution, source, residual);
-            Assert.AreEqual(IterationStatus.Running, status, "Should still be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should still be running");
 
             var status2 = criterium.DetermineStatus(16, solution, source, residual);
             Assert.AreEqual(IterationStatus.Converged, status2, "Should be done");
@@ -253,10 +253,10 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Double.Solvers.StopCrite
             var residual = new DenseVector(new[] {1.000, 1.000, 2.001});
 
             var status = criterium.DetermineStatus(5, solution, source, residual);
-            Assert.AreEqual(IterationStatus.Running, status, "Should be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should be running");
 
             criterium.Reset();
-            Assert.AreEqual(IterationStatus.Indetermined, criterium.Status, "Should not have started");
+            Assert.AreEqual(IterationStatus.Continue, criterium.Status, "Should not have started");
         }
 
         /// <summary>

src/UnitTests/LinearAlgebraTests/Single/Solvers/IteratorTest.cs

@@ -100,7 +100,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Single.Solvers
                 DenseVector.Create(3, i => 4),
                 DenseVector.Create(3, i => 4),
                 DenseVector.Create(3, i => 4));
-            Assert.AreEqual(IterationStatus.Running, iterator.Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, iterator.Status, "Incorrect status");
 
             // Second step, should run out of iterations.
             iterator.DetermineStatus(
@@ -132,13 +132,13 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Single.Solvers
                 DenseVector.Create(3, i => 4),
                 DenseVector.Create(3, i => 4),
                 DenseVector.Create(3, i => 4));
-            Assert.AreEqual(IterationStatus.Running, iterator.Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, iterator.Status, "Incorrect status");
 
             iterator.Reset();
-            Assert.AreEqual(IterationStatus.Indetermined, iterator.Status, "Incorrect status");
-            Assert.AreEqual(IterationStatus.Indetermined, criteria[0].Status, "Incorrect status");
-            Assert.AreEqual(IterationStatus.Indetermined, criteria[1].Status, "Incorrect status");
-            Assert.AreEqual(IterationStatus.Indetermined, criteria[2].Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, iterator.Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, criteria[0].Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, criteria[1].Status, "Incorrect status");
+            Assert.AreEqual(IterationStatus.Continue, criteria[2].Status, "Incorrect status");
         }
     }
 }

src/UnitTests/LinearAlgebraTests/Single/Solvers/StopCriterium/DivergenceStopCriteriumTest.cs

@@ -137,7 +137,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Single.Solvers.StopCrite
                     new DenseVector(new[] {1.0f}),
                     new DenseVector(new[] {(i + 1)*(Increase + 0.1f)}));
 
-                Assert.AreEqual(IterationStatus.Running, status, "Status check fail.");
+                Assert.AreEqual(IterationStatus.Continue, status, "Status check fail.");
             }
         }
 
@@ -161,7 +161,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Single.Solvers.StopCrite
                     new DenseVector(new[] {1.0f}),
                     new DenseVector(new[] {(i + 1)*(Increase - 0.01f)}));
 
-                Assert.AreEqual(IterationStatus.Running, status, "Status check fail.");
+                Assert.AreEqual(IterationStatus.Continue, status, "Status check fail.");
             }
         }
 
@@ -185,7 +185,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Single.Solvers.StopCrite
                     new DenseVector(new[] {1.0f}),
                     new DenseVector(new[] {(i + 1)*(Increase - 0.01f)}));
 
-                Assert.AreEqual(IterationStatus.Running, status, "Status check fail.");
+                Assert.AreEqual(IterationStatus.Continue, status, "Status check fail.");
             }
 
             // Now make it fail by throwing in a NaN
@@ -220,7 +220,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Single.Solvers.StopCrite
                     new DenseVector(new[] {1.0f}),
                     new DenseVector(new[] {previous}));
 
-                Assert.AreEqual(IterationStatus.Running, status, "Status check fail.");
+                Assert.AreEqual(IterationStatus.Continue, status, "Status check fail.");
             }
 
             // Add the final residual. Now we should have divergence
@@ -259,7 +259,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Single.Solvers.StopCrite
 
             Assert.AreEqual(Increase, criterium.MaximumRelativeIncrease, "Incorrect maximum");
             Assert.AreEqual(Iterations, criterium.MinimumNumberOfIterations, "Incorrect iteration count");
-            Assert.AreEqual(IterationStatus.Indetermined, criterium.Status, "Status check fail.");
+            Assert.AreEqual(IterationStatus.Continue, criterium.Status, "Status check fail.");
         }
 
         /// <summary>
@@ -280,11 +280,8 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Single.Solvers.StopCrite
             var clonedCriterium = clone as DivergenceStopCriterium;
             Assert.IsNotNull(clonedCriterium);
 
-            // ReSharper disable PossibleNullReferenceException
             Assert.AreEqual(criterium.MaximumRelativeIncrease, clonedCriterium.MaximumRelativeIncrease, "Incorrect maximum");
             Assert.AreEqual(criterium.MinimumNumberOfIterations, clonedCriterium.MinimumNumberOfIterations, "Incorrect iteration count");
-
-            // ReSharper restore PossibleNullReferenceException
         }
     }
 }

src/UnitTests/LinearAlgebraTests/Single/Solvers/StopCriterium/FailureStopCriteriumTest.cs

@@ -124,7 +124,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Single.Solvers.StopCrite
             var residual = new DenseVector(new[] {1.0f, 2.0f, 3.0f});
 
             var status = criterium.DetermineStatus(5, solution, source, residual);
-            Assert.AreEqual(IterationStatus.Running, status, "Should be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should be running");
         }
 
         /// <summary>
@@ -141,10 +141,10 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Single.Solvers.StopCrite
             var residual = new DenseVector(new[] {1000.0f, 1000.0f, 2001.0f});
 
             var status = criterium.DetermineStatus(5, solution, source, residual);
-            Assert.AreEqual(IterationStatus.Running, status, "Should be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should be running");
 
             criterium.Reset();
-            Assert.AreEqual(IterationStatus.Indetermined, criterium.Status, "Should not have started");
+            Assert.AreEqual(IterationStatus.Continue, criterium.Status, "Should not have started");
         }
 
         /// <summary>

src/UnitTests/LinearAlgebraTests/Single/Solvers/StopCriterium/IterationCountStopCriteriumTest.cs

@@ -97,7 +97,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Single.Solvers.StopCrite
             Assert.IsNotNull(criterium, "A criterium should have been created");
 
             var status = criterium.DetermineStatus(5, DenseVector.Create(3, i => 1), DenseVector.Create(3, i => 2), DenseVector.Create(3, i => 3));
-            Assert.AreEqual(IterationStatus.Running, status, "Should be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should be running");
 
             var status2 = criterium.DetermineStatus(10, DenseVector.Create(3, i => 1), DenseVector.Create(3, i => 2), DenseVector.Create(3, i => 3));
             Assert.AreEqual(IterationStatus.StoppedWithoutConvergence, status2, "Should be finished");
@@ -113,10 +113,10 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Single.Solvers.StopCrite
             Assert.IsNotNull(criterium, "A criterium should have been created");
 
             var status = criterium.DetermineStatus(5, DenseVector.Create(3, i => 1), DenseVector.Create(3, i => 2), DenseVector.Create(3, i => 3));
-            Assert.AreEqual(IterationStatus.Running, status, "Should be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should be running");
 
             criterium.Reset();
-            Assert.AreEqual(IterationStatus.Indetermined, criterium.Status, "Should not have started");
+            Assert.AreEqual(IterationStatus.Continue, criterium.Status, "Should not have started");
         }
 
         /// <summary>

src/UnitTests/LinearAlgebraTests/Single/Solvers/StopCriterium/ResidualStopCriteriumTest.cs

@@ -233,7 +233,7 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Single.Solvers.StopCrite
             var residual = new DenseVector(new[] {0.001f, 0.001f, 0.002f});
 
             var status = criterium.DetermineStatus(5, solution, source, residual);
-            Assert.AreEqual(IterationStatus.Running, status, "Should still be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should still be running");
 
             var status2 = criterium.DetermineStatus(16, solution, source, residual);
             Assert.AreEqual(IterationStatus.Converged, status2, "Should be done");
@@ -253,10 +253,10 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests.Single.Solvers.StopCrite
             var residual = new DenseVector(new[] {1.000f, 1.000f, 2.001f});
 
             var status = criterium.DetermineStatus(5, solution, source, residual);
-            Assert.AreEqual(IterationStatus.Running, status, "Should be running");
+            Assert.AreEqual(IterationStatus.Continue, status, "Should be running");
 
             criterium.Reset();
-            Assert.AreEqual(IterationStatus.Indetermined, criterium.Status, "Should not have started");
+            Assert.AreEqual(IterationStatus.Continue, criterium.Status, "Should not have started");
         }
 
         /// <summary>