in reply to Returning indices with same values for array within hash.

Deferencing the array reference that's the value associated with the hash key "NI" will get you there:

use strict;
use warnings;
use List::Util qw/min/;

my %matrix = ( NI => [ 1, 1, 3, 4 ] );
my @NI_index = grep { $matrix{NI}->[$_] == min @{ $matrix{NI} } } 0 ..
+ $#{ $matrix{NI} };
print "@NI_index";

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Output:

0 1

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Hope this helps!

Replies are listed 'Best First'.
Re^2: Returning indices with same values for array within hash.
by LanX (Saint) on Nov 10, 2013 at 15:55 UTC
    yes, but you don't really need the arrow after the first nesting level! =)

      DB<108> %matrix = (NI => [1 ,1 ,3 ,4] );
 => ("NI", [1, 1, 3, 4])

  DB<109> $matrix{NI}[3]
 => 4

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    Cheers Rolf

    ( addicted to the Perl Programming Language)

[reply]
[d/l]

      Good point!

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