I think that it is easier to use the indexes() function in List::MoreUtils.

the snippet "indexes{/^1$/}@colData" yields the index numbers of elements in @colData that contains just a "1". This is an XS module like List::Util's and runs very fast. Getting the textual name is a simple array look-up. These terms are pushed into a HashOfArray. So, 2 lines of code that do a lot of work!

#!/usr/bin/perl -w
use strict;
use List::MoreUtils qw(indexes);
use Data::Dumper;

my %family_data;
my @dataNames = qw( lacM    taba    mori    glyB    gly4);

<DATA>;   #skip the header line
while (<DATA>)
{
     my ($family, @colData) = split;
     push @{$family_data{$family}}, 
               map{$dataNames[$_]}indexes{/^1$/}@colData;
}

print Dumper(\%family_data);

=prints
$VAR1 = {
          'OG_2' => [
                      'taba',
                      'glyB'
                    ],
          'OG_1' => [
                      'lacM',
                      'mori'
                    ]
        };
=cut        


__DATA__
Family  lacM    taba    mori    glyB    gly4
OG_1    1   0   1   0   0
OG_2    0   1   0   1   0

[download]
Of course map{$dataNames[$_]}indexes{/^1$/}@colData;
could be map{$dataNames[$_]}indexes{$_}@colData;
but I thought the regex was less confusing albeit a bit slower.
either way is plausible, take your pick.

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

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