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POMerge lines and do operations if a condition is statisfied
 

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    <p>I'm new in perl and I would like to read a table and make a sum of some values from specific lines. This is a simplified example of my input file:</p> <p>INPUT :</p> <pre><code>Gene Size Feature GeneA 1200 Intron 1 GeneB 100 Intron 1 GeneB 200 Intron 1 GeneB 150 Intron 2 GeneC 300 Intron 5 </code></pre> <p>OUTPUT : </p> <pre><code>GeneA 1200 Intron 1 GeneB 300 Intron 1 &lt;-- the size values are summed GeneB 150 Intron 2 GeneC 300 Intron 5 </code></pre> <hr> <p>Because Gene B is present for intron 1 with two different sizes, I would like to sum these two values and print only one line per intron number.</p> <p>This is an example of code that I want to do. But I would like to make it more complicated if I can understand How to handle this kind of data.</p> <pre><code>#!/usr/bin/perl use strict; use warnings; my $sum; my @GAP_list; my $prevline = 'na'; open INFILE,"Table.csv"; while (my $ligne = &lt;INFILE&gt;) { chomp ($ligne); my @list = split /\t/, $ligne; my $gene= $list[0]; my $GAP_size= $list[2]; my $intron= $list[3]; my $intron_number=$list[4]; if($prevline eq 'na'){ push @GAP_list, $GAP_size; } elsif($prevline ne 'na') { my @list_p = split /\t/,$prevline; my $gene_p= $list_p[0]; my $GAP_size_p= $list_p[2]; my $intron_p= $list_p[3]; my $intron_number_p=$list_p[4]; if (($gene eq $gene_p) &amp;&amp; ($intron eq $intron_p) &amp;&amp; ($intron_number eq $intron_number_p)){ push @GAP_list, $GAP_size; } } else{ $sum = doSum(@GAP_list); print "$gene\tGAP\t$GAP_size\t$intron\t$intron_number\t$sum\n"; $prevline=$ligne; } } # Subroutine sub doSum { my $sum = 0; foreach my $x (@_) { $sum += $x; } return $sum; } </code></pre>
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    1. USuser2460670
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    1. COSoo, loop with a buffer of one line; if they are different, print the old line and store the current line; if they are equal, add the current line to the stored value? How are the parts seperated? By tab, or does each line match the regex `/^(\w+)\s+([0-9]+)\s+(.+)$/`?
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    2. COThanks amon for your help ! the values are seprated with tab(\t). But I would like a perl logic to do that, because I would like do did other operations using perl and the original data contain more than 65 coloumn;
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