Re: Writing an array inside an array

[moritz]

Please read Markup in the Monastery, and put <code>...</code> tags around your code.

You probably don't want to assing [] to @sub - that way the array doesn't become empty, but holds a single value, which is a reference to an empty array. Use @sub = () instead.

Also you'll probably want $graph[$i] = \@sub (no my before it. You're assigning to a part of an existing data structure, declaring a new variable doesn't make sense in that context).

Also please read perllol, which talks about arrays of array references.

[talha099]

Thank you very much!
Now, it gives me the error saying
Global symbol "$graph" requires explicit package name
in the line
 $graph[$i] = \@sub;
Can you please help me again?
Thanks very much!

[MishaMoose]

try using

my @graph = ();

when you initialize the variable at the top of your code. Think of it as a declaration. You should NOT use 'my' again on the variable however.

HtH

[talha099]

Yeah, it still gives me the error
"Global symbol "$graph" requires explicit package name at line 39".
The code which I have is


use strict;
use Graph::Matching;

use Graph::Matching qw(max_weight_matching);

my @sub = [];
my @list = split(',', $ARGV[0]);

#print("@list");

my $n = 0;
my @graph = ();
my $i = 0;
my $j = 0;

for ($i=0; $n<my $graph; $i++)
{
 for ($j=0; $j<=2; $j++)
  {
   $sub[$j] = $list[$n];
   $n++;
  }
 $graph[$i] = \@sub;
@sub = ();
}


Thank very much again!

[moritz]

Did you remove the line declaring @graph? The code compiles fine here...