Previously I was using the following: 

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

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This returns indices: "0 1"

Let's say now I want to put the array NI in a hash instead: 

my %matrix = (NI => [1 ,1 ,3 ,4] );

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How do you get the same output into @NI_index by modifying this line? Or is there another way to do it? 
my @NI_index = grep { $NI[$_] == min @NI } 0 .. $#NI;

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Thank you very much!

In reply to Returning indices with same values for array within hash. by pzj20012

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