I really don't see the point of that kind of problems where you can't use Matlab built-in functions.
Find the peak 3n+1 sequence value
Are all the three given point in the same line?
sum of non-primes
Check that number is whole number
Fill a zeros matrix
Return unique values without sorting
Unique values without using UNIQUE function
Wind outward from the center ...
Remove the two elements next to NaN value
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