I really don't see the point of that kind of problems where you can't use Matlab built-in functions.
Find the sum of all the numbers of the input vector
Implement a ROT13 cipher
01 - Scalar variables
Cody Computer Part 3 - Detect the graphic card used on Cody Computer
Return unique values without sorting
Cody Computer Part 1 - Guess the system font used by uipanel
Angle between two vectors
Set the array elements whose value is 13 to 0
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