LA: fix bug in Matrix.RemoveRow range checks

src/Numerics/LinearAlgebra/Matrix.cs

@@ -836,7 +836,7 @@ namespace MathNet.Numerics.LinearAlgebra
         /// <exception cref="ArgumentOutOfRangeException">If <paramref name="rowIndex"/> is &lt; zero or &gt; the number of rows.</exception>
         public Matrix<T> RemoveRow(int rowIndex)
         {
-            if (rowIndex < 0 || rowIndex > ColumnCount)
+            if (rowIndex < 0 || rowIndex > RowCount)
             {
                 throw new ArgumentOutOfRangeException("rowIndex");
             }

src/UnitTests/LinearAlgebraTests/MatrixStructureTheory.Reform.cs

@@ -134,7 +134,6 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests
         [Theory]
         public void CanRemoveRow(Matrix<T> matrix)
         {
-            var row = Vector<T>.Build.Random(matrix.ColumnCount, 0);
             for (var position = 0; position < matrix.RowCount; position++)
             {
                 var result = matrix.RemoveRow(position);
@@ -195,7 +194,6 @@ namespace MathNet.Numerics.UnitTests.LinearAlgebraTests
         [Theory]
         public void CanRemoveColumn(Matrix<T> matrix)
         {
-            var column = Vector<T>.Build.Random(matrix.RowCount, 0);
             for (var position = 0; position < matrix.ColumnCount; position++)
             {
                 var result = matrix.RemoveColumn(position);