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Finding unique values in a hash (Perl)

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# 1  
Old 01-18-2013
Finding unique values in a hash (Perl)
Hi,

I have a hash with unique keys associated with some data.

Code:
my %FINALcontigs = (
        'mira_rep_c765:119reads**', 'ctctactggaagactgac',
        'mira_rep_c7454:54reads**', 'atggatactgcgctgttgctaactactgga',
        'mira_rep_c6803:12reads**', 'atcgactggatgcagggttgtggtttcta',
        'mira_rep_c1661:6reads**', 'ctctactggaagactgac',
    );

Notice that 'mira_rep_c765:119reads**' and 'mira_rep_c1661:6reads**' have the same value. I need to find which keys have matching values. What is the easiest way to do this?

Thanks
# 2  
Old 01-18-2013
Take a look at the info on these links:
Perl - Printing duplicates in a hash
How do I find and count duplicate values in a perl hash - Stack Overflow
hth
This User Gave Thanks to spacebar For This Post:
jdilts
# 3  
Old 01-19-2013
One way:
Code:
#!/usr/bin/perl
use strict;
use warnings;

my %FINALcontigs = (
        'mira_rep_c765:119reads**', 'ctctactggaagactgac',
        'mira_rep_c7454:54reads**', 'atggatactgcgctgttgctaactactgga',
        'mira_rep_c6803:12reads**', 'atcgactggatgcagggttgtggtttcta',
        'mira_rep_c1661:6reads**', 'ctctactggaagactgac',
    );

my %seen_keys;

for my $ha_key (keys %FINALcontigs) {
 push @{$seen_keys{$FINALcontigs{$ha_key}}}, $ha_key
}

for my $ha_key (keys %seen_keys) {
 if(@{$seen_keys{$ha_key}} > 1) {
  print "\nDuplicate keys for value $ha_key:\n";
  print "$_\n" for (@{$seen_keys{$ha_key}});
 }
}

This User Gave Thanks to elixir_sinari For This Post:
jdilts
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