You try this,it will work. 
use strict;
use warnings;
use Data::Dumper;

my @triples = ("chr1 9837 9840", "chr1 99998 99999", "chr2 9838 9840")
+;


my($start,$chrom,$stop,$avg);
foreach my $triple (@triples){
        print "$triple :";
        ($chrom,$start,$stop)=split(/\s+/,$triple);
        my @values=();
        while ( defined(my $line=<DATA>) and !@values )
        {
                if ( $line =~ m/$chrom/)
                {
                        @values=get_values();
                        if(@values)
                        {
                                average(\@values);
                                print "Average:",average(\@values),"\n
+" ;
                        }
                }
        }
        print "Not Found:Average NA\n" unless (@values);
        seek DATA,0,0;
}



sub get_values
{
        my @values;
        while ( defined(my $line=<DATA>)  )
        {
                last unless $line =~ m/^\d/;
                my ($tag,$value) = split(/\s+/,$line);
                push (@values, $value) if ($tag >= $start and $tag <= 
+$stop);
        }
        return @values
}

sub average
{
        my ($array_ref) = @_;
        my $sum;
        my $count = scalar @$array_ref;
        foreach (@$array_ref) { $sum += $_; }
        return $sum / $count;
}

__DATA__
variableStep chrom=chr1
9837    0.010
9838    0.008
9839    0.007
9840    0.004
9841    0.002
9842    0.001
variableStep chrom=chr2
9837    0.090
9838    0.038
9839    0.017
9840    0.044
9841    0.052
9842    0.091

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In reply to Re: filtering data and while loop problem by nvivek
in thread filtering data and while loop problem by coldy

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