I really don't see the point of that kind of problems where you can't use Matlab built-in functions.
Arrange vector in ascending order
Calculate the Number of Sign Changes in a Row Vector (No Element Is Zero)
Find the nearest prime number
Find MPG of Lightest Cars
Convert a numerical matrix into a cell array of strings
Combinations without using nchoosek
Generate a string like abbcccddddeeeee
Create a vector whose elements depend on the previous element
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