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.
Renaming a field in a structure array
Matrix indexing with two vectors of indices
Oh Zero Zero Zero!!!
5 Prime Numbers
Combined Ages 4 - Non-symmetric with multiples, n ≥ 3
Lights Out 7 - 5x5, x moves
Divisible by n, Composite Divisors
Divisible by 7
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