HI, I have to find triplicates ProbeName $arg[8] in a txt file and calculate a mean of their associated valueProbe $args[13]
At the end my txt file has to contain unique probeName and valueProbe . This si my beginning of a script to pull out the probename and valueProbe information , I must say after that I don't know where to start to get duplicate and mean. use strict; use warnings; my @files = glob('/file/*sed91.txt'); foreach my $file (@files) { open (INFILE, "$file") or die "line15 $!"; open (OUTPUT, ">$file"."_output.txt") or die "line16 $!"; while (my $line= <INFILE>){ my @args =split (/\t/, $line); print OUTPUT $args[8] . "\t" . $args[13] ."\n"; } close OUTPUT; close INFILE; } Thanks Nat -- The Wellcome Trust Sanger Institute is operated by Genome Research Limited, a charity registered in England with number 1021457 and a compa ny registered in England with number 2742969, whose registered office is 2 15 Euston Road, London, NW1 2BE.