On Wed, 3 Oct 2001, Tyler Cruickshank wrote:
> I have a hash that I am storing arrays in. Each array corresponds to
> one hour of a day. After the hash has been populated I need to cycle
> through the "days" and sum them up. So, I have written my hash such
> that each key can be looped thru via a for loop.
>
> My keys are simply data.hr1, data.hr2, data.hr3, where each key is
> incremented via the for loop. The problem seems to be that when I use
> $specSum{$name}[$i] where $name would be data.hr1, data.hr2, data.hr3
> ... it doesnt work. How can I use a variable as a key to a hash? My
> code works just fine when I write $specSum{'data.hr1'}[$i]. A snippet
> of my code is pasted below. Thanks for the help.
>
> Cheers, Tyler.
>
> for(local $b=0; $b<=23; $b++){
Whoah, don't use local! You should be using my instead. Also, tehre's no
need to use C style loops.
To access a hash by a variable, you just grab all of the keys out of
it:
foreach my $key (keys %specSum) {
print "$key = $specSum{$key}\n";
}
An array reference at each hash element can then be dereferenced as
@{$specSum{$key}}
To cycle through that array ref, you can do:
foreach my $item (0..@{$specSum{$key}}) {
print "$item\n";
}
Or, if you need to use the array's index:
foreach my $i(0..$#{$specSum{$key}}) {
print "$specSum{$key}->[$i]\n";
}
-- Brett
http://www.chapelperilous.net/
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Delay is preferable to error.
-- Thomas Jefferson
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