tweaked vector scale routines

src/Numerics/Algorithms/LinearAlgebra/ManagedLinearAlgebraProvider.Complex.cs

@@ -67,7 +67,7 @@ namespace MathNet.Numerics.Algorithms.LinearAlgebra
 
             if (alpha.IsZero())
             {
-                CommonParallel.ElementFor(0, y.Length, y.Length, index => result[index] = y[index]);
+                Array.Copy(y, result, y.Length);
             }
             else if (alpha.IsOne())
             {
@@ -95,11 +95,11 @@ namespace MathNet.Numerics.Algorithms.LinearAlgebra
 
             if (alpha.IsZero())
             {
-                CommonParallel.ElementFor(0, x.Length, x.Length, index => result[index] = Complex.Zero);
+                Array.Clear(result, 0, result.Length);
             }
             else if (alpha.IsOne())
             {
-                CommonParallel.ElementFor(0, x.Length, x.Length, index => result[index] = x[index]);
+                Array.Copy(x, result, x.Length);
             }
             else
             {

src/Numerics/Algorithms/LinearAlgebra/ManagedLinearAlgebraProvider.Complex32.cs

@@ -61,7 +61,7 @@ namespace MathNet.Numerics.Algorithms.LinearAlgebra
 
             if (alpha.IsZero())
             {
-                CommonParallel.ElementFor(0, y.Length, y.Length, index => result[index] = y[index]);
+                Array.Copy(y, result, y.Length);
             }
             else if (alpha.IsOne())
             {
@@ -89,11 +89,11 @@ namespace MathNet.Numerics.Algorithms.LinearAlgebra
 
             if (alpha.IsZero())
             {
-                CommonParallel.ElementFor(0, x.Length, x.Length, index => result[index] = Complex32.Zero);
+                Array.Clear(result, 0, result.Length);
             }
             else if (alpha.IsOne())
             {
-                CommonParallel.ElementFor(0, x.Length, x.Length, index => result[index] = x[index]);
+                Array.Copy(x, result, x.Length);
             }
             else
             {

src/Numerics/Algorithms/LinearAlgebra/ManagedLinearAlgebraProvider.Double.cs

@@ -61,7 +61,7 @@ namespace MathNet.Numerics.Algorithms.LinearAlgebra
 
             if (alpha == 0.0)
             {
-                CommonParallel.ElementFor(0, y.Length, y.Length, index => result[index] = y[index]);
+                Buffer.BlockCopy(y, 0, result, 0, y.Length * Constants.SizeOfDouble);
             }
             else if (alpha == 1.0)
             {
@@ -89,11 +89,11 @@ namespace MathNet.Numerics.Algorithms.LinearAlgebra
 
             if (alpha == 0.0)
             {
-                CommonParallel.ElementFor(0, x.Length, x.Length, index => result[index] = 0.0);
+                Array.Clear(result, 0, result.Length);
             }
             else if (alpha == 1.0)
             {
-                CommonParallel.ElementFor(0, x.Length, x.Length, index => result[index] = x[index]);
+                Buffer.BlockCopy(x, 0, result, 0, x.Length * Constants.SizeOfDouble);
             }
             else
             {

src/Numerics/Algorithms/LinearAlgebra/ManagedLinearAlgebraProvider.Single.cs

@@ -61,7 +61,7 @@ namespace MathNet.Numerics.Algorithms.LinearAlgebra
 
             if (alpha == 0.0)
             {
-                CommonParallel.ElementFor(0, y.Length, y.Length, index => result[index] = y[index]);
+                Buffer.BlockCopy(y, 0, result, 0, y.Length * Constants.SizeOfFloat);
             }
             else if (alpha == 1.0)
             {
@@ -89,11 +89,11 @@ namespace MathNet.Numerics.Algorithms.LinearAlgebra
 
             if (alpha == 0.0)
             {
-                CommonParallel.ElementFor(0, x.Length, x.Length, index => result[index] = 0.0f);
+                Array.Clear(result, 0, result.Length);
             }
             else if (alpha == 1.0)
             {
-                CommonParallel.ElementFor(0, x.Length, x.Length, index => result[index] = x[index]);
+                Buffer.BlockCopy(x, 0, result, 0, x.Length * Constants.SizeOfFloat);
             }
             else
             {