Dear Monks,

I would like to modify (grow) a hash of hashes iteratively within a loop through a subroutine and in the end print what's stored in the hash. To do this I am passing a reference to the hash to the subroutine - at least I thought so. However, I get the error "Global symbol "%misfits" requires explicit package name at ...". This is the code that I can't get to work: 

#Main
my @whole_world = ();
my $misfits = {};   # the reference

foreach my $individual (@whole_world) {
    ($ok_ones, $misfits) = find_misfits(\@whole_world, $misfits);
}

print_misfits($misfits);

# sub
sub find_misfits {
    my ($whole_world, $misfits) = @_;

    my %candidates = ();

    # do stuff to find the misfits, ie compare the genetic setup of in
+dividuals

    # add individuals that don't fit to $misfits
        $misfits{$stand}{$mother}{$offspring} = {%{$candidate{$stand}{
+$mother}{$offspring}}};

    return ($misfits, some more structures);
}

[download]
Any help would be greatly appreciated.

In reply to Growing a Hash of Hashes via its reference by Henri

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