Hello Monks!
I need to do the following:
In a document with the following format:
>id1|various annotation1
sequence of characters1
>id2|various annotation2
sequence of characters2
...
>idN|various annotationN
sequence of charactersN

[download]
I want to group the lines that have the same various annotation and sequence but not the same id into one line, like this:
>id1-id15-id22|various annotation1
sequence of characters1
...

[download]
When the various annotation is the same, then the sequence is also the same.
I am pretty sure I need to use the map command, but I am a bit unsure how I would handle this. So far I have used it when I have 2 things to compare, e.g. only the id that would change and the sequence that could be repeated, and I was grouping based on the sequence. Like this:
use strict;
use warnings;

my %res;
while (<>) 
{
    chomp;
    my ( $name, $rest ) = split /\t/;
    push @{ $res{$name} }, $rest;
}
for ( sort keys %res ) 
{
    print "$_:", join( ",", @{ $res{$_} } );
    print "\n";
}

[download]

But now, I have 3 things instead.

In reply to How do I use the map command for this? by Anonymous Monk

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