If my over-use of str2num has in any way caused offense, I hereby beg leave to apologize.
My hat's off to you for such a solution. I'm baffled as to how to decode it (pun intended). I know that there has been a lot of furor over the use of regexp and other string-based functions, conversions, etc. to lower solution sizes for problems in general, but this problem is string-based, so I see no problem in solving it via arcane string methods.
Find relatively common elements in matrix rows
Unique values without using UNIQUE function
Determine if input is a perfect number
Count consecutive 0's in between values of 1
Dimensions of a rectangle
Singular Value Decomposition
Legend of Zelda - Rupee Count
Scrabble Scores - 4
Rule of mixtures (composites) - reverse engineering
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