accessing values from multidimensional arrays

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

Hi monks, I am trying to work on a bit of code that uses multidimensional arrays to store the coordinates for an imagemap and then accesses these coords to insert the links.

However, my code doesn't work. When i try to print the value of the $coords variable, it returns an array reference, not a number - which makes me think I am accessing the values wrong.

Any advice would be lovely ;->


# @numbers contains numerical data
# @links contains the name of the file where the graph is

my @coords = (undef, [13,9,6], [29,9,7], [44,9,6], [59,10,6], [75,9,7]
+, [91,10,5], [106,9,7], [122,9,7], [137,9,7], [152,10,6], [169,9,7], 
+[184,9,6]);


 for my $goal ( 1..12 )    {

    for my $well ( @numbers )    {

         my $img = ( $well == $goal )
                  ? $links[$goal-1]
                   : "array.bmp";

          my $coords = join ',', ${coords[$goal]};
          
         # print "COORDS: @coords<P>";

         print qq(<area href="http://host/cgi-bin/temp/$img" 
                  ALT="" shape="circle" 
                  coords="$coords">);

    }

 }
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Re: accessing values from multidimensional arrays by broquaint (Abbot) on May 30, 2003 at 09:24 UTC
Try this `my $coords = join ',', @{ $coords[$goal] };` [download] That dereferences the array stored in the element at `$goal` in `@coords`. See. `perlreftut` and tye's References quick reference for further help. HTH `_________ broquaint`	[reply] [d/l]
Re: accessing values from multidimensional arrays by arthas (Hermit) on May 30, 2003 at 09:35 UTC
The arrays contained in @coords are actually array references (created using square brackets), so you should write: `my $coords = join ',', @{$coords[$goal]};` [download] instead of: `my $coords = join ',', ${coords[$goal]};` [download] In other words, you need to dereference your arrays. Michele.	[reply] [d/l] [select]