public void ToArray2D()
{
MatrixD m = new MatrixD(3, 4, rowMajor, MatrixOrder.RowMajor);
double[,] array = m.ToArray2D();
Assert.AreEqual(3, array.GetLength(0));
Assert.AreEqual(4, array.GetLength(1));
for (int i = 0; i < 3; i++)
for (int j = 0; j < 4; j++)
Assert.AreEqual(i * 4 + j + 1, array[i, j]);
array = (double[,]) m;
Assert.AreEqual(3, array.GetLength(0));
Assert.AreEqual(4, array.GetLength(1));
for (int i = 0; i < 3; i++)
for (int j = 0; j < 4; j++)
Assert.AreEqual(i * 4 + j + 1, array[i, j]);
m = null;
array = (double[,]) m;
Assert.IsNull(array);
}