Hi,
At 05:33 AM 4/24/2007, Andrej Kastrin wrote:
Dear all,
Question about the sum function; the file structure is as follows:
A|100
A|200
A|150
B|20
B|90
C|10
C|30
C|300
The result I want to obtain is to sum values in the second column
(columnB) for each particular letter in the first column (ColumnA); e.g.:
A|450
B|100
C|330
I don't want to use hash structure because the input file is very large.
Is there any simple way to do that step-by-step: to sum up values in
columnB until the letter in columnA changes and print the result...
Thanks in advance for any suggestion, Andrej
#!/usr/bin/perl
use strict;
use warnings;
open FH1, "< test.txt" or die "Can't open file : $!";
my %hash;
while (<FH1>) {
chomp;
my ($columnA,$columnB)=split /\|/;
$hash{$columnA} += $columnB;
}
use Data::Dumper;
print Dumper \%hash;
a little exercise :-)
Shiping
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