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Re: How to compare hash values within the same hash?

by Marshall (Monsignor)
on Sep 25, 2013 at 10:00 UTC ( #1055642=note: print w/replies, xml ) Need Help??

in reply to How to compare hash values within the same hash?

I think you want the peg counts (3rd printout below), but I showed some other stuff just for fun.
#!usr/bin/perl -w use strict; # my %hash = ( key1 => 10, key3 => 3, key2 => 10, key4 => 5, key5 => 10, key6 => 3, ); # The keys don't matter. # What matters is the histogram of the values. my %histo; #histogram of each key's summary data my %pegs; #peg count's of each key #a bit brain boggling, but it works for a sum... #the (my $value's) are pre-computed at start of the loop # foreach my $value (values %hash) { $pegs{$value}++; $histo{$value}+=$value; } # # various print formats... # print "histo sort by key:\n"; foreach my $x (sort {$a <=> $b} keys %histo) { print "$x => $histo{$x}\n"; } print "\nhisto sort by inverse value:\n"; foreach my $x (sort {$histo{$b} <=> $histo{$a}} keys %histo) { print "$x => $histo{$x}\n"; } print "\nPeg counts of values\n"; foreach my $x (sort {$pegs{$a} <=> $pegs{$b}} keys %pegs) { print "$x => $pegs{$x}\n"; } =summary of prints: sort by key of sums: 3 => 6 #keys 3,6 5 => 5 #keys 5 10 => 30 #keys 1,2,5 sort by inverse value of sums: (note swap of $b and $a) #I did that to make it a bit more interesting... 10 => 30 3 => 6 5 => 5 Peg counts of values: (value and number of times seen) 5 => 1 3 => 2 10 => 3 =cut
There are a number of ways to present the max (eg 10 => 3) peg count, but what do you want if say 3=>3 also?

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