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.
Back to basics 4 - Search Path
Find the largest value in the 3D matrix
Are all the three given point in the same line?
Center of mass
The sum of the numbers in the vector
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