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Re^2: matrix - creating total row/column

by GertMT (Friar)
on Oct 15, 2009 at 21:45 UTC ( #801441=note: print w/replies, xml ) Need Help??


in reply to Re: matrix - creating total row/column
in thread matrix - creating total row/column

this worked out very nice. Thank you very much. A bit puzzled though..

I understand that for my $i (keys %from_to_bytes) {should be read as: for all members of the family (Fred, Wilma and so on).

However I remain in trouble reading the remaining two lines:

for my $j (keys %{ $from_to_bytes{$i} }) { $total_col{$j} += $from_to_bytes{$i}->{$j};
It works but I'd like to understand as well.

Using hashes maybe efficient, learning how to use them takes some time for me.

Gert

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[LanX]: OH
[LanX]: you are talking about signatures?
[GotToBTru]: yes, it turns out I am
[LanX]: http://perldoc. perl.org/perlsub. html#Prototypes
[GotToBTru]: that page, strangely enough, never mentions that construct
[LanX]: ; is for optional prototypes
[LanX]: & is codeblock @ array
[GotToBTru]: okay, that is there in the text, not in literal use in any of the examples
[GotToBTru]: the text suggest it is redundant before @
[LanX]: propably ... I also notice new stuff

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