I really don't see the point of that kind of problems where you can't use Matlab built-in functions.
Check if number exists in vector
Is the input divisible by 3?
length of a vector
Sum of series I
Generate a string like abbcccddddeeeee
Make a logical diamond using GALLERY function
Number of bytes required to store a sparse matrix
Cody Computer Part 1 - Guess the system font used by uipanel
Convert a structure into a string
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