Ok, this should be a simple problem, but its not working out for me. I need to use matlab to show that the columns of a 3x3 matrix are orthonormal. I called each of the columns separate vectors, because I thought it would be easier. So now I have 3 3x1 vectors. I want to multiply them together to show they are orthogonal. But matlab keeps returning an error. Saying that internal dimensions must match or something. Anyone know why this is happening? Also, is there an easy way to show that the vectors are normal? I dont know of any commands to show this. Thanks guys.