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.
Find all elements less than 0 or greater than 10 and replace them with NaN
Back to basics 1 - Saving
Back to basics 7 - Equal NaNs
Method of Common Differences part-1
Maximum value in a matrix
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