bug: added missing leftmultiply fix that was dropped during the last merge

minor optimization for scalar matrix multiply for user defined matrices

src/Numerics/LinearAlgebra/Complex/DenseMatrix.cs

@@ -340,6 +340,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex
             }
             else
             {
+                CopyTo(result);
                 Control.LinearAlgebraProvider.ScaleArray(scalar, denseResult.Data);
             }
         }
@@ -397,7 +398,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex
                     1.0,
                     denseLeft.Data,
                     1,
-                    denseResult.Count,
+                    denseLeft.Count,
                     Data,
                     RowCount,
                     ColumnCount,

src/Numerics/LinearAlgebra/Complex/SparseMatrix.cs

@@ -1238,6 +1238,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex
             }
             else
             {
+                CopyTo(result);
                 Control.LinearAlgebraProvider.ScaleArray(scalar, sparseResult._nonZeroValues);
             }
         }

src/Numerics/LinearAlgebra/Complex32/DenseMatrix.cs

@@ -340,6 +340,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32
             }
             else
             {
+                CopyTo(result);
                 Control.LinearAlgebraProvider.ScaleArray(scalar, denseResult.Data);
             }
         }
@@ -397,7 +398,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32
                     1.0f,
                     denseLeft.Data,
                     1,
-                    denseResult.Count,
+                    denseLeft.Count,
                     Data,
                     RowCount,
                     ColumnCount,

src/Numerics/LinearAlgebra/Complex32/SparseMatrix.cs

@@ -1238,6 +1238,7 @@ namespace MathNet.Numerics.LinearAlgebra.Complex32
             }
             else
             {
+                CopyTo(result);
                 Control.LinearAlgebraProvider.ScaleArray(scalar, sparseResult._nonZeroValues);
             }
         }

src/Numerics/LinearAlgebra/Double/DenseMatrix.cs

@@ -329,6 +329,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double
             }
             else
             {
+                CopyTo(result);
                 Control.LinearAlgebraProvider.ScaleArray(scalar, denseResult.Data);
             }
         }

src/Numerics/LinearAlgebra/Double/SparseMatrix.cs

@@ -1237,6 +1237,7 @@ namespace MathNet.Numerics.LinearAlgebra.Double
             }
             else
             {
+                CopyTo(result);
                 Control.LinearAlgebraProvider.ScaleArray(scalar, sparseResult._nonZeroValues);
             }
         }

src/Numerics/LinearAlgebra/Generic/Matrix.Arithmetic.cs

@@ -218,7 +218,7 @@ namespace MathNet.Numerics.LinearAlgebra.Generic
                 return;
             }
 
-            CopyTo(result);
+            //CopyTo(result);
             DoMultiply(scalar, result);
         }
 

src/Numerics/LinearAlgebra/Single/DenseMatrix.cs

@@ -329,6 +329,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single
             }
             else
             {
+                CopyTo(result);
                 Control.LinearAlgebraProvider.ScaleArray(scalar, denseResult.Data);
             }
         }
@@ -386,7 +387,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single
                     1.0f,
                     denseLeft.Data,
                     1,
-                    denseResult.Count,
+                    denseLeft.Count,
                     Data,
                     RowCount,
                     ColumnCount,

src/Numerics/LinearAlgebra/Single/SparseMatrix.cs

@@ -1237,6 +1237,7 @@ namespace MathNet.Numerics.LinearAlgebra.Single
             }
             else
             {
+                CopyTo(result);
                 Control.LinearAlgebraProvider.ScaleArray(scalar, sparseResult._nonZeroValues);
             }
         }