MatrixStorage: more reasonable GetHashCode #534

src/Numerics/LinearAlgebra/Storage/MatrixStorage.cs

@@ -190,8 +190,13 @@ namespace MathNet.Numerics.LinearAlgebra.Storage
             {
                 for (var i = 0; i < hashNum; i++)
                 {
-                    var col = i%ColumnCount;
-                    var row = (i - col)%RowCount;
+#if PORTABLE || NETSTANDARD
+                    int col = i%ColumnCount;
+                    int row = i/ColumnCount;
+#else
+                    int col;
+                    int row = Math.DivRem(i, ColumnCount, out col);
+#endif
                     hash = hash*31 + At(row, col).GetHashCode();
                 }
             }