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Re: Sorting a File which contains numbers

by Hofmator (Curate)
on Oct 30, 2006 at 14:11 UTC ( #581298=note: print w/replies, xml ) Need Help??


in reply to Sorting a File which contains numbers

Watch out: sort sorts normally "in standard string comparison order" which is NOT numerically. In order to sort numerically, you have to use an explicit sort routine.

With your expamle input file, this won't make a difference though, as it sorts the same numerically AND alphabetically.

-- Hofmator

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[hippo]: For explanation, I've seen this construct in someone else's code (no names, no pack drill) and couldn't think of a situation to trigger it.
[Corion]: You'll have to look somewhere esoteric for that. Maybe some tied variable or special dualvar can also trigger that. But it's certainly not a common occurrence
[Corion]: And on 5.20, the following also outputs no find:perl -wle 'for my $x ("\x{2000}".."\ x{1fffff}") { if( $x && ! length $x ) { warn qq(<$x>); warn length $x; die } }'
[Corion]: (this time on Unix)
[hippo]: Understood. I'll have to go through the code and see if it's doing anything fancy with ties, dual-vars or non-scalars. In the end, it's probably a bug though.
[Corion]: Aaah - you should be able to do this with overload, but I would hit somebody really hard if they constructed objects that are true but the empty string, and you not knowing about the domain knowledge where this makes sense

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