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Re: Permutations in reverse order (easy)

by tye (Sage)
on Mar 02, 2013 at 02:04 UTC ( #1021373=note: print w/ replies, xml ) Need Help??

in reply to Permutations in reverse order

Simply replace each element of a returned permutation with 15-$_.

- tye        

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Re^2: Permutations in reverse order (easy)
by wanna_code_perl (Pilgrim) on Mar 02, 2013 at 09:19 UTC

    Thank you, tye. You know, I had tried this early on, but discarded the idea at the time because I was still getting inconsistent results with Algorithm::Permute. Algorithm::Permute explicitly doesn't guarantee any order to its results, but it was ordered when the items where initially in lex order (which mine were not). I later found the fine print in the docs, but I didn't think to revisit the $max - $_ transformation. Switching to Algorithm::Loops, combined with this $max - $_ suggestion, was the solution.

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