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.
Extract leading non-zero digit
The Hitchhiker's Guide to MATLAB
Find best domino orientation
Sum of series VII
Find my daddy long leg (No 's')
Rule of mixtures (composites) - other bound
Self-similarity 1 - Every other term
Scrabble Scores - 3
Radiation Heat Transfer — View Factors (3)
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