Datastructure

[Bioperler]

HI!

Actually I'm about to code a tool, that's able to track users of a
website (using cookies). However, I've got a problem with the sorting of
the data. I need a data structure like this:

%hash(array(array)) "hash of an array of an array"

So for testing purposes I generated a small dataset, which looks like this:


%HoAoA = (
hash1 => [
( [ "first", "second" ],
[ "third" , "fourth" ],
[ "fifth" , "sixth" ]
)
],
hash2 => [
( [ "9th", "10th" ],
[ "11th" , "12th" ]
)
]

);

So while it was no problem to acces all data fields using nested loops,
I was not able to append data to these arrays listed above. Array's push
doesn't seem to work for this.

Example of what I want to do:
push($HoAoA{hash1}[2], "seventh");


Any suggestions?

 

[Peter Makholm]

%HoAoA = (
hash1 => [
( [ "first", "second" ],
[ "third" , "fourth" ],
[ "fifth" , "sixth" ]
)
],

You don't need the inner ()'s

hash2 => [
( [ "9th", "10th" ],
[ "11th" , "12th" ]
)
]

);

Example of what I want to do:
push($HoAoA{hash1}[2], "seventh");

The first argument to push should be an actual array and not just an
reference. So you have to dereference it:

push @{ $HoAoA{hash1}[2] }, "seventh";

//Makholm

 

[John W. Krahn]

Actually I'm about to code a tool, that's able to track users of a
website (using cookies). However, I've got a problem with the sorting of
the data. I need a data structure like this:

%hash(array(array)) "hash of an array of an array"

So for testing purposes I generated a small dataset, which looks like this:

%HoAoA = (
hash1 => [
( [ "first", "second" ],
[ "third" , "fourth" ],
[ "fifth" , "sixth" ]
)
],
hash2 => [
( [ "9th", "10th" ],
[ "11th" , "12th" ]
)
]

);

So while it was no problem to acces all data fields using nested loops,
I was not able to append data to these arrays listed above. Array's push
doesn't seem to work for this.

Example of what I want to do:
push($HoAoA{hash1}[2], "seventh");

Any suggestions?

You have to dereference the array (push only modifies arrays):

push @{ $HoAoA{ hash1 }[ 2 ] }, 'seventh';



John

 

[Bioperler]

%HoAoA = (
hash1 => [
( [ "first", "second" ],
[ "third" , "fourth" ],
[ "fifth" , "sixth" ]
)
],

You don't need the inner ()'s

Yes, you're right. But actually the structure is a bit more complex - I
just shorted it a little bit to ease it.

hash2 => [
( [ "9th", "10th" ],
[ "11th" , "12th" ]
)
]

);

Example of what I want to do:
push($HoAoA{hash1}[2], "seventh");

The first argument to push should be an actual array and not just an
reference. So you have to dereference it:

push @{ $HoAoA{hash1}[2] }, "seventh";

Thanks! This works. Seems as I have to read a little bit about that

 

[Tad McClellan]

Peter Makholm wrote:

push @{ $HoAoA{hash1}[2] }, "seventh";

Thanks! This works. Seems as I have to read a little bit about that

You can do that with:

perldoc perlreftut