Dearest monks, I have an array of hashes which I call @database. The keys for all the hashes are identical--they all have the same number of keys and the keys have the same names. I want to take dot products (and from that angles) of the first hash with the other hashes using PDL. Here is what I have: 

my $pdl1 = pdl (values(%{$database[0]}));
my $n1 = norm $pdl1;
my ($pdl2, $n2, $dotproduct, $d, @angles);
for (0..$3database) {
      $pdl2 = pdl (values (%{$database[$_]}));
      $n2 = norm $pdl2;
      $dotproduct = inner ($n1, $n2);
      $d = dotproduct->sclr();
      $angles[$_] = (180/3.1415926)*acos($d);
}

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My problem is that the angles aren't right. could it be that perl is not sorting the values of each hash consistently? Is there a way to easily and efficiently correct for this? Yours humbly, Evan

In reply to Lining up many hash values by Evanovich

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