Re: matrix - creating total row/column

by bichonfrise74 (Vicar)
 on Oct 13, 2009 at 22:06 UTC ( #800985=note: print w/replies, xml ) Need Help??

in reply to matrix - creating total row/column

Hi,

From how I understood your question, you want to get the total for each columns... So, I replaced this code
```for my \$to (sort keys %from_to_bytes){
printf "%10s", "\$from_to_bytes{\$to}";
}
with this one.
```my %total_col;
for my \$i (keys %from_to_bytes) {
for my \$j (keys %{ \$from_to_bytes{\$i} }) {
\$total_col{\$j} += \$from_to_bytes{\$i}->{\$j};
}
}

print " " x 11;
for my \$i (sort keys %total_col) {
printf " %10s", "\$total_col{\$i}";
}

print "\n";
Although as you can see there is some more work needed in the formatting. Hope this helps.

Replies are listed 'Best First'.
Re^2: matrix - creating total row/column
by GertMT (Friar) on Oct 15, 2009 at 21:45 UTC

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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