On Jan 18, 11:06 pm, [EMAIL PROTECTED] (Kevin Viel) wrote:
> This I cannot get my mind around...
>
> My data:
>
> SNP Genotype
> 1 CC
> 1 CT
> 1 TT
> 1 NN
>
> It seems to me that I need a hash of hashes.
>
> Inner hash:
>
> $inner{ $Genotype }++ ;
>
> Since the value of the out hash ( $outer{ $SNP } ) has to be a scalar, this
> scalar has to be a reference to the inner hash, correct? If so, how do I
> declare them?
>
> my %outer ;
>
> Or should it be a reference to an anonymous hash?
>
> my $outer = +{} ;
>From what you've told us so far there is nothing to pick or choose
between the two. Both will work perfectly well. It's largely a matter
of personal taste (TIMTOWTDI).
> So that my code might look like:
>
> $outer -> { $SNP }{ $Genotype }++ ;
And, if you'd declared a hash named %outer, it would look like:
$outer{ $SNP }{ $Genotype }++ ;
> Any help or reference is appreciated.
If you are planning to pass you outer hash into subroutines as an
argument then using $outer={} has an advantage over %outer in so far
as the code inside and outside the subroutines will look similar (in
that it'll all have -> operators). This is both aesthetically
pleasing[1] and may also aid maintainability.
[1] Which gives me a chance to plug this year's YAPC::Europe
"Beautiful Perl"
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