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 relatively common elements in matrix rows
Determine Whether an array is empty
Who is the smartest MATLAB programmer?
07 - Common functions and indexing 1
Change matrix to vector
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