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how do i keep track repeated keys with different values.

subodheee
Novice

Dec 27, 2009, 9:18 PM

Post #1 of 2 (2564 views)

how do i keep track repeated keys with different values.	Can't Post

hi,

i have a csv file with repeated keys with different values, i need to add values for the repeated keys. i tried using hashes but it takes the only last value. is there a way that i can keep track of repeated keys and add values for each repeated key.

example: am taking key as a time. same time 40:09.1 repeats for 4 times. for this 4 times i want to add correponding values. when i used hash this is not happening.

time value1 value2 value3
40:09.1 32.3 33.4 21.3
40:09.1 21.3 35.4 22.6
40:09.1 22.4 19.2 14.9
41:01.1 12.3 11.2 12.3
40:09.1 31.2 11.2 19.3

can anyone help me here.

(This post was edited by subodheee on Dec 27, 2009, 9:21 PM)

shawnhcorey
Enthusiast

Dec 28, 2009, 6:57 AM

Post #2 of 2 (2552 views)

Re: [subodheee] how do i keep track repeated keys with different values. [In reply to]	Can't Post

You would use a complex data structure. For more details, see `perldoc perldsc` or http://perldoc.perl.org/perldsc.html

Code

#!/usr/bin/perl 
 
use strict; 
use warnings; 
 
use Data::Dumper; 
 
# Make Data::Dumper pretty 
$Data::Dumper::Sortkeys = 1; 
$Data::Dumper::Indent   = 1; 
 
# Set maximum depth for Data::Dumper, zero means unlimited 
$Data::Dumper::Maxdepth = 0; 
 
my %data = (); 
while( <DATA> ){ 
  chomp; 
  my ( $time, @value ) = split; 
  push @{ $data{$time} }, \@value; 
} 
 
print Dumper \%data; 
 
__DATA__ 
40:09.1 32.3 33.4 21.3 
40:09.1 21.3 35.4 22.6 
40:09.1 22.4 19.2 14.9 
41:01.1 12.3 11.2 12.3 
40:09.1 31.2 11.2 19.3

__END__

I love Perl; it's the only language where you can bless your thingy.

Perl documentation is available at perldoc.perl.org. The list of standard modules and pragmatics is available in perlmodlib.

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