Updating an array within a hash

[Soumyadeep Nandi]

Hi Everybdy,
I am stuck in a problem for which I need your help. My
problem spins around adding an element in an array
within a hash.
I have a hash declared as $hash{"1"}=@array; now I
want to add an element to it within a loop. How would
I do this? I would be highly grateful to you if you
could help me.

Regards
Soumyadeep

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[Jan Eden]

Soumyadeep nandi wrote:

>Hi Everybdy,
>I am stuck in a problem for which I need your help. My
>problem spins around adding an element in an array
>within a hash.
>I have a hash declared as $hash{"1"}=@array; now I
>want to add an element to it within a loop. How would
>I do this? I would be highly grateful to you if you
>could help me.

Your syntax puts a number (the number of elements in @array into $hash{"1"}.

I guess you want to set an array reference as the hash key's value:

$hash{"1"} = \@array;

In that case, you can just

push @{$hash{"1"}}, $_ for (...list goes here...);

to push into the array referenced by $hash{"1"}.

Best,

Jan
--
These are my principles and if you don't like them... well, I have others. - Groucho Marx

[Stephen Hardisty]

> Hi Everybdy,

> I am stuck in a problem for which I need your help. My
> problem spins around adding an element in an array
> within a hash.
> I have a hash declared as $hash{"1"}=@array; now I
> want to add an element to it within a loop. How would
> I do this? I would be highly grateful to you if you
> could help me.

Hi,
I'm not sure you can just go "hash = array" as they're somewhat different, in the same way you can't go "scalar = array" (you can but it won't do what you think). But you can assign the hash the reference of the array. For example:
$hash{1} = \@array;

Or:
push(@{$hash{1}}, @array);

Then to loop through the array whose reference is assigned to $hash{1} you can do:
foreach(@{$hash{1}})
{
# do something with $_
}

Cheers!

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[John W. Krahn]

Jan Eden wrote:

>
> Soumyadeep nandi wrote:
>

> >I am stuck in a problem for which I need your help. My
> >problem spins around adding an element in an array
> >within a hash.
> >I have a hash declared as $hash{"1"}=@array; now I
> >want to add an element to it within a loop. How would
> >I do this? I would be highly grateful to you if you
> >could help me.

>
> Your syntax puts a number (the number of elements in @array into $hash{"1"}.
>
> I guess you want to set an array reference as the hash key's value:
>
> $hash{"1"} = \@array;
>
> In that case, you can just
>
> push @{$hash{"1"}}, $_ for (...list goes here...);
>
> to push into the array referenced by $hash{"1"}.

The second argument of push() is a list so you don't need a for loop
there.

push @{$hash{"1"}}, (...list goes here...);


:-)
John
--
use Perl;
program
fulfillment

[Soumyadeep Nandi]

Hi Jan and Stephen,

I could solve my problem. The way I could do is as
follows:

push (@{$C{$range}}, $c);

where C is the hash having keys some integers and
values as an array. So I could add more elements($c)
to the array inside that hash(%C) is as above.

Thank you so much Stephen and Jan for help and
suggestions.



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