If I understand you correctly, you want to compare the difference of each line with 70% of the value of the *first line* third column value. If that is the case, simply do this:

my $minvalue;
foreach (@temp){
  my @t= split("\t",$_);
  $minvalue= $t[2] if (not defined $minvalue);
  if( $x =~ ($t[4]-$t[3]) > 70 * $minvalue/100) {
    ...

[download]

This method works whether you have the whole file in memory or are reading it line by line from a file.

Note that you can move the calculation of the 70% to the line where you initialize $minvalue, so that it is calculated once instead of every time through the loop.

In reply to Re: to print l columnwise and subtraction by jethro
in thread to print l columnwise and subtraction by vis1982

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