This is great advice, and makes the process much more time and memory efficient! The one follow up question I have is pertaining to the line 

   
while( <INTERVAL> ) {
    my( $start, $end ) = split "\t", $_;

[download]

The text file being read has 3 columns, the first of which is non-numeric. If I specify the variables with 


foreach my $interval (<INTERVAL>){
            
    my @find_interval = split(/\t/, $interval);
    my $start = $find_interval[1]; 
    my $end = $find_interval[2];

[download]

would that accomplish the same thing?

In reply to Re^4: A question About Array Indexing by ccelt09
in thread A question About Array Indexing by ccelt09

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