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
Similar Triangles - find the height of the tree
Back to basics 1 - Saving
Return the first and last character of a string
Pi Estimate 1
Angle between two vectors
Convert a structure into a string
Unique values without using UNIQUE function
Set some matrix elements to zero
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