I have a program in Perl that reads one line at a time from an input data file and computes certain statistics. Then, it writes the result in a separate output file and reads a new line from the input data file, and so on... Every now and then, while the program reads through my input data file, I get a warning about an "uninitialized value" and I would like to know which line in the input data file generates this warning. Is there any way I can tell Perl to print (to screen or file) the data point that is generating the error? My actual code is pretty long so I'm posting just a portion of it to give an idea (together with the error message that I get when running the program.) 
    #!/usr/bin/perl
    use strict;
    use warnings;
    use diagnostics;
    use Data::Dumper;


    open (F, "input.csv");
    my @lines=<F>;
    close(F);

    open (F1,'>>output.csv');

    define my variables;

    for (my $i=1; $i<@lines; $i++){

    read in one line of data;
    do stuff;

    write to file;
    }

    close(F1);

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The type of error I get when running the program is: "Use of uninitialized value $Top5 in division (/) at builder.pl line 403 (#1)

In reply to Find data point generating Error in Perl code by kgherman

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