I can see some answers have been supplied to solve the problem of entering the values into an Hash via a mapped grep. I have looked at the initial problem of identifying multiple values within each line. The aligned families can be retrieved using an array reading loop. However I caqn imagine further data manipulation would mean having the families in a hash may be more helpful in future reference. Here is how I would initially extract the multiple values via an array loop.

use strict;
use warnings;

my $gendata = './gen.dat';
open GENDAT, "< $gendata" or die "can't open $gendata $!";
my @count;

while (<GENDAT>){
 push @count, $_;
}
close GENDAT;

my $a=shift @count;
my @families=split(/\s+/,$a);
my $b=0;

foreach my $c(@count){
  my @state;
  push @state, split(/\s+/,$c);
  print $state[0].' ';
    
    for($b=0;$b<=$#state;$b++){
     print $families[$b].' ' if $state[$b] eq '1';
    }
  print $/;
}


exit (0);

[download]

this gives:

OG_1 lacM mori
OG_2 taba glyB

[download]

A different approach might be assigning values to each of the families and then extract the 01 strings and convert them into a binary then return the relevant family pair as determined by the binary value. Of course this would only work if there were a definite 2 unique families per 'OG'.

In reply to Re: Getting indices of the same value that occurs multiple times in an array... by Don Coyote
in thread Getting indices of the same value that occurs multiple times in an array... by reubs85

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