Doing this is very simple, but you haven't explained the problem very well. How are the values averaged, exactly? Does each file have the same series of indexes, and you want the values counted and averaged and then the indexes / averages put into the output file? If a key doesn't appear in a file, is the count still incremented?

use strict;
use warnings;

my ($file, $handle, $key, $val, %data);

for $file ('file1.txt', 'file2.txt', 'file3.txt',
           'file4.txt' , 'file5.txt') {
    open($handle, $file);
    while (<$handle>) {
        chomp;
        ($key, $val) = split /\s/, $_;
        $data{$key}{'count'}++;
        $data{$key}{'sum'} += $val;
    }
}

open($handle, '>average.txt');
for $key (sort { $a <=> $b } keys %data) {
    $data{$key} = $data{$key}{'sum'} / $data{$key}{'count'};
    print $handle "$key\t$data{$key}\n";
}
close($handle);

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In reply to Re: averages from multiple files by TJPride
in thread averages from multiple files by Taylorswift13

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