Here's another idea... a little convoluted...there's probably a nicer way to write it 
$hash{$_} = [
  ( $hash{$_}->[0] || 0 ) + $numbers[$i++],
  ( $hash{$_}->[1] || 0 ) + 1
]  foreach @sequence;

print $_, ( $hash{$_}->[0] / $hash{$_}->[1] ) foreach keys %hash;

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In reply to Re: finding matches in the same array by RazorbladeBidet
in thread finding matches in the same array by Anonymous Monk

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