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.
N-Dimensional Array Slice
Flip the main diagonal of a matrix
middleAsColumn: Return all but first and last element as a column vector
Integer Sequence - II : New Fibonacci
Combined Ages 3 - Non-symmetric, n ≥ 3
I Plead the Fifth
Rule of mixtures (composites) - weighted bound
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