If you really want help with this problem, put together a small test suite that gives some inputs and some sample outputs (that you tabulate by hand) and wait for someone to produce a MATLAB function to do what you want.
This is an interesting problem. Acting as an administrator, I cleaned it up and added some tests.
Project Euler: Problem 8, Find largest product in a large string of numbers
Project Euler: Problem 9, Pythagorean numbers
Sum the elements in either diagonal of a square matrix
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