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    <p>Here are the points you need to change<br> Use another variable for the headers<br></p> <pre><code>my $count = 0; my @header = (); my @average = (); </code></pre> <p>then change the logic inside if statement<br></p> <pre><code>if ( $count == 1 ) { @header = @columns; } </code></pre> <p>Now don't use the <code>@average</code> for the limit, use <code>$i &lt; scalar @columns</code> for else statement. Initially <code>@average</code> is zero, you will never get inside the for loop ever.</p> <pre><code>else { for( my $i = 1; $i &lt; scalar @columns; $i++ ) { $average[$i] += $columns[$i]; } } </code></pre> <p>Finally add <code>-1</code> to your counter. Remember you increment your counter when you parse your header</p> <pre><code>for( my $i = 1; $i &lt; scalar @average; $i++ ) { print $average[$i]/($count-1), "\n"; } </code></pre> <p>Here is the final code<br> You can take advantage of <code>@header</code> to display the result neatly</p> <pre><code>#!/usr/bin/perl -w use strict; my $infile = "Lab1_table.txt"; # This is the file path open INFILE, $infile or die "Can't open $infile: $!"; my $count = 0; my @header = (); my @average = (); while (&lt;INFILE&gt;) { chomp; my @columns = split /\t/; $count++; if ( $count == 1 ) { @header = @columns; } else { for( my $i = 1; $i &lt; scalar @columns; $i++ ) { $average[$i] += $columns[$i]; } } } for( my $i = 1; $i &lt; scalar @average; $i++ ) { print $average[$i]/($count-1), "\n"; } </code></pre> <p>There are other ways to write this code but I thought it would be better to just correct your code so that you can easily understand what is wrong with your code. Hope it helps</p>
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    1. POHow do I average column values from a tab-separated data file, ignoring a header row and the left column?
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    1. POHow do I average column values from a tab-separated data file, ignoring a header row and the left column?
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    1. COI just wanted to thank you considerably for this. I really do. It works perfectly and I can see the right averages. 0 for the first column, and the other ones are regarded as 'header'.
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    2. COI've now created an 'outfile' action, so that I can print the results to a text file. The .txt file is produced, but no text is within it. First, the output I get from my amended script comes out with this statement: 'code' Argument "" isn't numeric in ddition (+) at line X, <INFILE> line Y.'code' The above occurs 5 times, and I presume this is due to the non-numerical headers in my source file (as noted in my above comment). This is followed then by '0' (which I presume is the first column), and then the 4 required averages. I just can't seem to print to file, for some reason.
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    3. COIt would be better if you create another question for that.
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