Hi Monks,

Could I pick your brains regarding some array wrangling?

I have an input file that looks something like:

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

[download]

and I would like to know, for each family, which two members are '1', possibly storing them as a hash in which the key = family (eg OG_1) and the value = 'lacM mori' or something similar...

I am able to manipulate this such that I can get the name of the first incidence of '1', by using (the input file has been read into the array @COUNT):

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

my %participants;  
foreach (@COUNT) {
    my @a=split(/\s+/,$_);
    my $og=$a[0];
    my $search_for="1";  ## search for participants in that OG
    my ( $index )= grep { $a[$_] eq $search_for } 0..$#a; 
    $participants{$og}=$index;
}

my %og_to_gid;  
foreach my $k (keys %participants) {
    $og_to_gid{$k}=$families[$participants{$k}];
}

[download]

which gives, within the %og_to_gid hash, a result whereby the key = OG_1 and the value = lacM, in this case (sorry about the weird variable names; I'm a genome biologist (and genome biologists are weird anyway)), which was fine for a previous script but now I really need to know the names of BOTH the members for each family.

Any ideas would be most welcome! Is there something within for example List::Utils that could do it? I had a look but I couldn't see anything...

Thanks once again,

Reuben

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

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