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.
Find the two most distant points
Find the sum of the elements in the "second" diagonal
Reverse the elements of an array
MATCH THE STRINGS (2 CHAR) very easy
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