Clarification: For b, with "a string" it seems you accept both string arrays and char arrays. For c, with "matrix" it seems you require a numeric array — this is different from MATLAB's definition of a "matrix".
Thank you David Verrelli. I have modified the problem description to try to reflect that.
Alphabetize by last name
poll: would you like the regexp (?@cmd) functionality to be banned in Cody?
Create the following sequence : 0 1 1 4 9 25 64 169 ...
Set x value to each even index of vector y.
Check availability of a number in an array
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