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.
Distance walked 1D
Back to basics 21 - Matrix replicating
Multiply a column by a row
Given area find sides
Replace x value into y value in string text.
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