Re: Creating and Accessing 3-D array

How many row arrays do you create in total? 3. How many rows do you want? 9, 3 per sheet. Do you see the problem?

Another hint would be that your loop structure for populating the array is different than your loop structure for getting from the array, yet you are looping over the same array. How can that be?

Fix:

for my $sheet (1..3) {
   my @sheet;
   for my $row (1..3) {
      my @row;
      for my $col (1..3) {
         push @col, 0;
      }
      push @sheet, \@row;
   }
   push @sheets, \@sheet;
}
[download]

Thanks to autovivification, this can actually be simplified.

for my $sheet (1..3) {
   for my $row (1..3) {
      for my $col (1..3) {
         $sheets[$sheet][$row][$col] = 0;
      }
   }
}
[download]

Comment on Re: Creating and Accessing 3-D array Select or Download Code

Replies are listed 'Best First'.
Re^2: Creating and Accessing 3-D array by Anonymous Monk on Feb 06, 2011 at 13:51 UTC
Yes, I figured out my mistake. Autovivification is great tool. I did it that way (lazy me :-)) In my opinion, autovivification should not be taught to a beginner. It makes creating multidimentional arrays so simple that, lazy people like me will never study data structures chapter .. :-) Thanks Chak --- Laziness is the mother of invention (My philosophy)	[reply]
Re^3: Creating and Accessing 3-D array by ikegami (Patriarch) on Feb 07, 2011 at 02:26 UTC
The equivalent without autovivification of the snippet using autovivification is `( ( $sheets[$sheet] //= [] )->[$row] //= [] )->[$col] = 0;` [download] Your choice.	[reply] [d/l]