I really don't see the point of that kind of problems where you can't use Matlab built-in functions.
Remove NaN ?
Arrange vector in ascending order
Find nearest prime number less than input number
04 - Scalar Equations 1
Unique values without using UNIQUE function
Cody Computer Part 4 : Are you a morning Cody player Addicted ?
Generate a string like abbcccddddeeeee
Join Strings with Multiple Different Delimiters
Return unique values without sorting
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