Good job on commenting your code!
Return the 3n+1 sequence for n
How to subtract?
Rotate a Matrix by 90 degrees
Reverse the elements of an array
Arrange the names in alphabetical order (1)
Curve fitting (linear functions) & function handles
Guess the number I'm thinking of
Testing for randomness: uniform distribution of real numbers (distribution checking)
Curve fitting (non-linear functions) & function handles
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