On May 20, Nikola Janceski said:
>This returns an odd number of elements:
>
>my %BYNAME = map { { "$ALL{$_}" => "$_" } } keys %ALL;
You've got an extra set of { } in there. The inner one makes a hash
reference, so if the hash has an odd number of keys, there will be an odd
number of hash refere
--- "John W. Krahn" <[EMAIL PROTECTED]> wrote:
> ...
> %byname = reverse %hash;
Thanks John, that was the concise way to do it. Time
for someone to do the benchmarks between this and the
"while each" method I did.
I *think* the latter will be faster (or at least less
memory hungry) - but perha
> any ideas on how to create reverse hash quick?
> ...
while (my ($key, $value) = each %hash) {
warn "Collision during inversion!"
if exists $hash{$value};
$new_hash{$value} = $key;
}
of course, if you are doing this a lot then you
need a different structure. The solution is
obv
Nikola Janceski wrote:
>
> That would be my grep method
>
> $pc = grep $testvalue eq $HASH{$_}, keys %HASH;
>
> any ideas on how to create reverse hash quick?
> This returns an odd number of elements:
>
> my %BYNAME = map { { "$ALL{$_}" => "$_" } } keys %ALL;
$ perl -le'
%hash = (
PC1 => "Nik
found it... some damn values were empty.
> -Original Message-
> From: Nikola Janceski [mailto:[EMAIL PROTECTED]]
> Sent: Monday, May 20, 2002 5:17 PM
> To: 'Timothy Johnson'; Nikola Janceski; Beginners (E-mail)
> Subject: RE: Fastest method with a hashes...
>
imothy Johnson [mailto:[EMAIL PROTECTED]]
> Sent: Monday, May 20, 2002 5:08 PM
> To: 'Nikola Janceski'; Beginners (E-mail)
> Subject: RE: Fastest method with a hashes...
>
>
>
> The only other thing I can think of that you haven't mentioned is just
> cycling t
{$_} = $myvalue){
print "I've got a flying machine!\n";
}
}
-Original Message-
From: Nikola Janceski [mailto:[EMAIL PROTECTED]]
Sent: Monday, May 20, 2002 2:03 PM
To: Beginners (E-mail)
Subject: Fastest method with a hashes...
I have a hash as follows:
PC1 => Niko
I have a hash as follows:
PC1 => Nikola Janceski
PC2 => Some Moron
PC3 => Some Other Moron
etc..
I want to be able to get the key (PC#) using the value, what's the fastest
method?
What I can think of:
a. have a reversed hash of the same info.
b. use that funky module which makes hashes go both
