How to sort a hash by its values?

supernewbie has asked for the wisdom of the Perl Monks concerning the following question:

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Re: How to sort a hash by its values? by MZSanford (Curate) on Jul 19, 2001 at 20:38 UTC
The most solid answers can be found here. remeber the immortal word's of Socrates who said, "I drank what ?"	[reply]
Re: How to sort a hash by its values? by Masem (Monsignor) on Jul 19, 2001 at 20:39 UTC
Sure, you just want to sort the keys based on their values: `my %hash = ( ... ); my @sorted_keys = sort { $hash{ $a } <=> $hash{ $b } } keys %hash; print $_, " ", $hash{ $_ }, "\n" foreach ( @sorted_keys );` [download] Update fixed terminology ----------------------------------------------------- Dr. Michael K. Neylon - mneylon-pm@masemware.com \|\| "You've left the lens cap of your mind on again, Pinky" - The Brain	[reply] [d/l]
Re: How to sort a hash by its values? by Hofmator (Curate) on Jul 19, 2001 at 20:42 UTC
Yes, there is, have a look at keys (to get the keys from the hash and then you also get the values), sort (for, well, sorting), perlop (for comparing numerical values) and printf (for outputting nicely) Then write some code. And if you have any problems then come back to us. -- Hofmator	[reply]
Re: How to sort a hash by its values? by OzzyOsbourne (Chaplain) on Jul 20, 2001 at 15:55 UTC
See How do I sort a hash (optionally by value instead of key)? in perlfaq4. -OzzyOsbourne	[reply]
Re: How to sort a hash by its values? by earthboundmisfit (Chaplain) on Jul 19, 2001 at 20:40 UTC
why doesn't this work? `print $_ , "\n" foreach (sort values %x);` [download] Update: My poor wording made this sound like a golf. I'm really confused as to why this doesn't work but take out `sort` and it appears to	[reply] [d/l]
Re: Re: How to sort a hash by its values? by davorg (Chancellor) on Jul 19, 2001 at 20:50 UTC
a) You're only printing the values, when the question asked for the key/value pairs and b) you're doing a lexical sort - not a numeric one. -- <http://www.dave.org.uk> Perl Training in the UK <http://www.iterative-software.com>	[reply]
Re: Re: How to sort a hash by its values? by dsb (Chaplain) on Jul 19, 2001 at 20:57 UTC
That particular code won't work because without explicitly comparing the values like '`$a <=> $b`', the `sort` function will treat the values as strings and sort based on the first byte rather than its integer value. So rather than: `314 232 82 0` [download] You get: `0 232 314 82` [download] Hope that helps. Amel - f.k.a. - kel	[reply] [d/l] [select]