Others have already advised you to use the strict and warnings pragmata. Do yourself a big favor and heed this sage advice. (If you're a beginning Perler, the diagnostics module is a good adjunct to warnings.) Here's why: 

>perl -le
"my @mra = ( [ qw(a b eye c) ],  [ qw{w x y z} ], );
 ;;
 print qq{'$mra[1][2]'};
 print qq{'$mra[i][2]'};
"
'y'
'eye'

>perl -le
"use warnings;
 ;;
 my @mra = ( [ qw(a b eye c) ],  [ qw{w x y z} ], );
 ;;
 print qq{'$mra[1][2]'};
 print qq{'$mra[i][2]'};
"
Unquoted string "i" may clash with future reserved word at -e line 1.
'y'
Argument "i" isn't numeric in array element at -e line 1.
'eye'

>perl -le
"use warnings;
 use strict;
 ;;
 my @mra = ( [ qw(a b eye c) ],  [ qw{w x y z} ], );
 ;;
 print qq{'$mra[1][2]'};
 print qq{'$mra[i][2]'};
"
Bareword "i" not allowed while "strict subs" in use at -e line 1.
Execution of -e aborted due to compilation errors.

[download]

In the presence of strictures, this particular mistake does not even compile. This, IMHO, is the best possible fate for this code. It's nice to have a warning, but a warning is only generated if the code is executed, and the particular code producing a warning may only be traversed on a daily/weekly/monthly basis. You may find yourself plowing through an enormous log file in search of some clue to a transient problem. Some even take the extra step of escalating all warnings to fatality, so at least a warning will be the last entry in a log file concerning a particular program. Caveat programmor.

In reply to Re: Multiarray does not read correct value from a table by AnomalousMonk
in thread Multiarray does not read correct value from a table by korak

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