There are two things you can do to emulate a multi dimensional hash. The first is to use nested hashes: 

my $idx = substr $Fld57, 3, 5;
$CNT{$idx}{$Fld1}{$Fld15}++;
$COST{$idx}{$Fld1}{$Fld15} += $Fld14;

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The second possibility is to use a separator to join the indexes. Be sure that the separator doesn't occur in the indexes: 

my $idx = substr $Fld57, 3, 5;
$CNT{$idx . $Fld1 . $Fld15}++;
$COST{$idx . $Fld1 . $Fld15} += $Fld14;

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(. is string concatenation).

Depending on how you want to retrieve your data, one or the other version might be more suitable for you.

The usual hints apply: always start your programs with 

use strict;
use warnings;

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and declare your variables with my.

Perl 6 in German

In reply to Re: Multidimensional Hash implementation/usage by moritz
in thread Multidimensional Hash implementation/usage by subhankar

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