public void ToArray()
{
DoubleMatrix a = new DoubleMatrix(2);
a[0,0] = 1;
a[0,1] = 2;
a[1,0] = 3;
a[1,1] = 4;
double[,] b = a.ToArray();
Assert.AreEqual(a[0,0], b[0,0]);
Assert.AreEqual(a[0,1], b[0,1]);
Assert.AreEqual(a[1,0], b[1,0]);
Assert.AreEqual(a[1,1], b[1,1]);
}