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GertMT
<p>this worked out very nice. Thank you very much. A bit puzzled though..</p>
I understand that <code>for my $i (keys %from_to_bytes) {</code>should be read as: for all members of the family (Fred, Wilma and so on).</p>
<p>However I remain in trouble reading the remaining two lines:<code>for my $j (keys %{ $from_to_bytes{$i} }) {
$total_col{$j} += $from_to_bytes{$i}->{$j};</code>
It works but I'd like to understand as well.</p><p>Using hashes maybe efficient, learning how to use them takes some time for me.</p>Gert
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