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.
Encode Roman Numerals
Multiply 2 numbers
Find the nearest integer
Back to Basics - New Data Type in R2016b - convert a char to a string
Change matrix to vector2
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