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 longest sequence of 1's in a binary sequence.
Return the 3n+1 sequence for n
Inner product of two vectors
Check if number exists in vector
Simple date to serial no. conversion
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