hash of hash of array slices

[Paul Kraus]

This works

Foreach ( @{$hash{$key1}{$key2}} )

This does note

Foreach ( @{($hash{$key1}{$key2})[9..1]} )

This gives me this error ....
Can't use undefined value as an array reference.

TIA,

Paul Kraus
-----------------------
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Network Administrator
-----------------------
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[Charles K. Clarkson]

Paul Kraus <pkraus@pelsupply.com> wrote:
:
: This works
:
: Foreach ( @{$hash{$key1}{$key2}} )
:
: This does note
:
: Foreach ( @{($hash{$key1}{$key2})[9..1]} )
:
: This gives me this error ....
: Can't use undefined value as an array reference.
:


foreach ( reverse @{ $hash{$key1}{$key2} }[ 1 .. 9 ] ) {


HTH,

Charles K. Clarkson
--
Head Bottle Washer,
Clarkson Energy Homes, Inc.
Mobile Home Specialists
254 968-8328

[Paul Kraus]

> Paul Kraus <pkraus@pelsupply.com> wrote:

> :
> : This works
> :
> : Foreach ( @{$hash{$key1}{$key2}} )
> :
> : This does note
> :
> : Foreach ( @{($hash{$key1}{$key2})[9..1]} )
> :
> : This gives me this error ....
> : Can't use undefined value as an array reference.
> :
>
>
> foreach ( reverse @{ $hash{$key1}{$key2} }[ 1 .. 9 ] ) {

That was a typo should have read [ 1..10]

And the code doesn't work.
Hmmmm

[Jeff 'Japhy' Pinyan]

On Jan 26, Paul Kraus said:

>foreach ( @{($hash{$key1}{$key2})[9..1]} )

It should be:

foreach ( @{ $hash{$key1}{$key2} }[1 .. 10] ) { ... }

based on your other email.

--
Jeff "japhy" Pinyan [email]japhy@pobox.com[/email] [url]http://www.pobox.com/~japhy/[/url]
RPI Acacia brother #734 [url]http://www.perlmonks.org/[/url] [url]http://www.cpan.org/[/url]
<stu> what does y/// stand for? <tenderpuss> why, yansliterate of course.
[ I'm looking for programming work. If you like my work, let me know. ]

[Paul Kraus]

> -----Original Message-----

> From: Jeff 'japhy' Pinyan [mailto:japhy@perlmonk.org]
> Sent: Monday, January 26, 2004 12:10 PM
> To: Paul Kraus
> Cc: 'Perl Beginners'
> Subject: Re: hash of hash of array slices
>
> On Jan 26, Paul Kraus said:
>

> >foreach ( @{($hash{$key1}{$key2})[9..1]} )

>
> It should be:
>
> foreach ( @{ $hash{$key1}{$key2} }[1 .. 10] ) { ... }
>
> based on your other email.

This worked fine. However I was under the impression that any time you
worked with a slice that you had to surround the array in parenthesis.

When else does this not apply?

[Charles K. Clarkson]

: -----Original Message-----
: From: Paul Kraus [mailto:pkraus@pelsupply.com]
: Sent: Monday, January 26, 2004 10:52 AM
: To: 'Charles K. Clarkson'; 'Perl Beginners'
: Subject: RE: hash of hash of array slices
:
:
: > Paul Kraus <pkraus@pelsupply.com> wrote:
: > :
: > : This works
: > :
: > : Foreach ( @{$hash{$key1}{$key2}} )
: > :
: > : This does note
: > :
: > : Foreach ( @{($hash{$key1}{$key2})[9..1]} )
: > :
: > : This gives me this error ....
: > : Can't use undefined value as an array reference.
: > :
: >
: >
: > foreach ( reverse @{ $hash{$key1}{$key2} }[ 1 .. 9 ] ) {
: That was a typo should have read [ 1..10]
:
: And the code doesn't work.

Worked for me:

my( $key1, $key2 ) = qw| foo bar |;

my %hash;
$hash{$key1}{$key2} = [ 0 .. 20 ];

foreach ( reverse @{ $hash{$key1}{$key2} }[ 1 .. 9 ] ) {
print "$_\n";
}

Charles K. Clarkson
--
Head Bottle Washer,
Clarkson Energy Homes, Inc.
Mobile Home Specialists
254 968-8328

[Tim Johnson]

I think that only applies to a list slice, i.e. (split /\s+,$_)[3..9],
but an array slice doesn't need it, i.e. @array[2]

-----Original Message-----
From: Paul Kraus [mailto:pkraus@pelsupply.com]
Sent: Monday, January 26, 2004 9:38 AM
To: [email]japhy@pobox.com[/email]
Cc: 'Perl Beginners'
Subject: RE: hash of hash of array slices


This worked fine. However I was under the impression that any time you
worked with a slice that you had to surround the array in parenthesis.

When else does this not apply?