Matrix Examples

This slide proves that matrix multiplication is not comutative.

ex)AB will not work but BA will because in AB the inner dimensions are not the same(that's how you know they can't be multiplied).They are the same in BA though(that's how you know they can be multiplied).

Here are some more examples.

to see a website that helps explain, click the link below.

http://en.wikipedia.org/wiki/Matrix_multiplication