public void TestIndex()
{
Matrix3By3 original = new Matrix3By3(1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0);
Assert.AreEqual(1.0, original[0, 0]);
Assert.AreEqual(2.0, original[0, 1]);
Assert.AreEqual(3.0, original[0, 2]);
Assert.AreEqual(4.0, original[1, 0]);
Assert.AreEqual(5.0, original[1, 1]);
Assert.AreEqual(6.0, original[1, 2]);
Assert.AreEqual(7.0, original[2, 0]);
Assert.AreEqual(8.0, original[2, 1]);
Assert.AreEqual(9.0, original[2, 2]);
}