Well, I figured out that the problem was not suited
for a multi-dimensional hash, but rather just a hash.
And I didn't know that hashes flattened out like
arrays when one is stored within another. References
are actually next on my list, but I've still a bit to
go with hashes. Thanks for all the advice so far.
-stu
--- "R. Joseph Newton" <[EMAIL PROTECTED]> wrote:
> Stuart White wrote:
>
> > I've a problem that I think is best solved with
> > multi-dimensional hashes. However, the reference
> that
> > I'm using doesn't really cover them. Does anyone
> know
> > where I might find some tutorial article of some
> sort
> > with an example or two on multi-dimensional
> hashes?
> >
> > I know that the syntax for referring to an element
> > within the inner hash is:
> > $hash1[$hash2[$hash2key]]
>
> Careful about "knowing" things, Stuart. It is
> hanging you up.
> There are no multidimensional hashes in the sense
> that you are
> trying to use them. Please stop wasting your time
> on that tack, and
> put your energy into the more productive path of
> learning
> references. Only the outer hash in a
> multidimensional hash can be a
> hash itself. Hashes can not be stored inside of
> either arrays or
> other hashes. That is a dead end.
>
> OTOH, *references to hashes* can be stored anywhere
> a scalar can,
> which means that you can build multidimesional hash
> structures to
> depths limited only by the resources of your
> computer.
>
> Given that you will be using references throughout
> the internal
> structure of your hash, you may as well start out
> with a reference:
> my $md_hash_base = {}; # $md_hash_base is now a
> reference to the
> anonymous hash on the right.
> $md_hash_base->{'kid'} = {}; # first generation
> $md_hash_base->{'kid'}->{'grandkid'} = {};
> $md_hash_base->{'kid'}->{'grandkid'}->{'great
> grandkid'} = {name =>
> 'Humphrey', birthweight => '3.82 KG'};
> print "$md_hash_base->{'kid'}->{'grandkid'}->{'great
> grandkid'}->{'birthweight'}\n";
> my $little_un =
> $md_hash_base->{'kid'}->{'grandkid'}->{'great
> grandkid'};
> print "$little_un->{'name'}\n";
>
>
> Joseph
>
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