how should i put it back together?

You could write 

    foreach my $val (@values){
        $val *= $df * 50 ;
    }
    print join("\t", @values), "\n";

[download]

This would modify the values in-place in the array (because $val is an alias for the respective elements in the array), so you can simply join them with a tab after the for loop.

Or shorter, with map: 

    print join("\t", map { $_ * $df * 50 } @values), "\n";

[download]

or maybe even 

...
while (<FILE>){
    print join("\t", map { $_ * $df * 50 } split /\t/), "\n";
}

[download]

In reply to Re^5: handling tab delimited files by almut
in thread handling tab delimited files by shaludr

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