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.
Sum of first n terms of a harmonic progression
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Given a matrix, swap the 2nd & 3rd columns
Find vampire numbers
Approximation of Pi (vector inputs)
Dice roll - opposite faces
Highly divisible triangular number (inspired by Project Euler 12)
Stress-Strain Properties - 1
Divisible by 4
Divisible by n, prime divisors from 20 to 200
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