Since you are willing to use tools like fliplr (as opposed to flip. Anyway, fliplr and flipud are more descriptive, so I kind of like them.) But then what is wrong with the simple:
H = [1 2 3; 4 5 6; 7 8 9]
Hflip = fliplr(flipud(H))
which requires only 2 calls. Or, if you like a matrix multiply, you could do it as:
trans = flip(eye(3));
trans*H*trans
