Hi i have a tsv containing two columns. I have loaded the two columns in seperate rows. I want to subtract the 1st value in second column with the 2nd value in the first column and keep going on till the end of the file. When i try subtracting the 1st element in the second column with the 1st element 1st column it works perfectly fine. When i try to start with the index of 1,0 in array for subtraction, i get error as "use of uninitialized value". please help me i dont know how to figure out the correct assignment. 
       while (<FILE>)
{
    chomp;
    ($first,$second)=split ("\t");
    my @first_column= split '\n',$first;
    my @second_column=split '\n',$second;
    my $a=0;
    my $b=0;
    print "$first_column[$a]";
    print "\t$second_column[$b]";
    my $e=$second_column[$b]-$first_column[$a];
    print "\t$e\n";
    
$a++;
$b++;

}

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In reply to unable to parse different rows in array by rocketperl

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