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.
Volume of this donut
Solve the set of simultaneous linear equations
Set the array elements whose value is 13 to 0
sum of first 'n' terms
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