To allocate new memory for the hash, this is similar to what you did for the arrays ie , {%imolecule}. 
%imolecule = (
        'maxval' => [@maxval],
        'minval' => [@minval],
        'range' => [@mp],
        'label' => $molcount,
        'peers' => '0',
          );

push @allmolecules, {%imolecule};

[download]
Update: So some example code for you... This is an Array of Hash (AoH). You were on the right track realizing that you can't just push a ref to %imolecule. [@maxval] expands @maxval and then puts it into a new hunk memory that is an anonymous array (i.e. makes a "deep" copy). The hash can be handled in the same way. Any way, you can have a "molecule template" that you fill out and then push onto @allmolecules. 
#!/usr/bin/perl -w
use strict;
use Data::Dumper;

my @allmolecules;
my @maxval = (11,12,13);
my @minval = (1,2,3);
my @mp = (1,13);
my $molcount = 2;

my %imolecule = (
        'maxval' => [@maxval],
        'minval' => [@minval],
        'range' => [@mp],
        'label' => $molcount,
        'peers' => '0',
          );
push @allmolecules, {%imolecule};

$molcount = 444;
@maxval = (66, 78, 90);
 %imolecule = (
        'maxval' => [@maxval],
        'minval' => [@minval],
        'range' => [@mp],
        'label' => $molcount,
        'peers' => '0',
          );          
          
push @allmolecules, {%imolecule};

my $n=1;
foreach my $href (@allmolecules)
{
   print "Molecule: ", $n++,":\n";
   
   foreach my $key (sort keys %$href)
   {
      if (ref($href->{$key}) eq 'ARRAY')
      {
         print "$key @{$href->{$key}}\n";
      }
      else
      {
         print "$key $href->{$key}\n";
      }
   }
   print "\n";
}

print "Data Dumper output is....\n";
print Dumper \@allmolecules;

__END__
output:
Molecule: 1:
label 2
maxval 11 12 13
minval 1 2 3
peers 0
range 1 13

Molecule: 2:
label 444
maxval 66 78 90
minval 1 2 3
peers 0
range 1 13

Data Dumper output is....
$VAR1 = [
          {
            'maxval' => [
                          11,
                          12,
                          13
                        ],
            'peers' => '0',
            'minval' => [
                          1,
                          2,
                          3
                        ],
            'range' => [
                         1,
                         13
                       ],
            'label' => 2
          },
          {
            'maxval' => [
                          66,
                          78,
                          90
                        ],
            'peers' => '0',
            'minval' => [
                          1,
                          2,
                          3
                        ],
            'range' => [
                         1,
                         13
                       ],
            'label' => 444
          }
        ];

[download]

In reply to Re: Help creating/printing array of hashes by Marshall
in thread Help creating/printing array of hashes by tomdbs98

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