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.
Sort a list of complex numbers based on far they are from the origin.
Calculate the Levenshtein distance between two strings
Determine Whether an array is empty
Converting numbers back from extended form
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