Hello,
I am parsing a file and extracting two columns to use as key value pairs in a
hash. After parsing the file and assigning the key value pairs my hash is empty when there should be 24750 key value pairs.
Any ideas on how I can get all of the key value pairs into the hash? 

#!/usr/bin/perl -w
use strict;
use Data::Dumper;
#open file
open(IN,"CCDS.20090902.txt") or die " Can't open ccds file: $!";
# initialize the hash
my %geneids =();
#open the file and push the info from the designated columns into it
# remove header
my $firstline = <IN>;
chomp $firstline; 
while(<IN>){
    chomp; # remove the newline character
    my @fields = split (/\t/, $_);
    #extract the columns that we are interested in.
    my($key, $value) = ($fields[2], $fields[3]);
    # Populate the key value pairs of the hash with $gene and $id
    $geneids{$key} = $value;
    print "$key\t$value\n";
}
# We can also get the size of the hash
print "Hash size: ", scalar keys %geneids, "\n";
close();
__DATA__
#chromosome    nc_accession    gene    gene_id    ccds_id    ccds_stat
+us
1    NC_000001.8    NCRNA00115    79854    CCDS1.1    Withdrawn
1    NC_000001.10    SAMD11    148398    CCDS2.2    Public
1    NC_000001.10    NOC2L    26155    CCDS3.1    Public
1    NC_000001.10    PLEKHN1    84069    CCDS4.1    Public
1    NC_000001.10    HES4    57801    CCDS5.1    Public
1    NC_000001.10    ISG15    9636    CCDS6.1    Public
1    NC_000001.10    C1orf159    54991    CCDS7.2    Public
1    NC_000001.10    TTLL10    254173    CCDS8.1    Public
1    NC_000001.10    TNFRSF18    8784    CCDS9.1    Public
1    NC_000001.10    TNFRSF18    8784    CCDS10.1    Public
1    NC_000001.10    TNFRSF4    7293    CCDS11.1    Public
1    NC_000001.10    SDF4    51150    CCDS12.1    Public
1    NC_000001.10    B3GALT6    126792    CCDS13.1    Public
1    NC_000001.10    UBE2J2    118424    CCDS14.1    Public

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LomSpace

In reply to How do I dynamically populate a hash after parsing columns from a file by lomSpace

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