Hi, I've got a pretty complicated hash structure that I want to save to disk for reloading later. The structure has PDL's in it. After saving I looked at the file and it seems like the data dumper has not created a correct string. Being new to Perl, I can't interpret the code created by the dumper. But I know that one of the fields should contain a 20x10 PDL, and in the string, it is relatively short. Here is the section of the output that was created by Data::Dumper and saved to a file: 
$VAR1 = {
          'totGrain' => 5,
          'grain' => [
                       {
                         'vList' => [
                                      bless( do{\(my $o = 143207480)},
+ 'PDL' ),
                                      bless( do{\(my $o = 143300056)},
+ 'PDL' ),
                                      .
                                      .
                                      .
                                      bless( do{\(my $o = 135713008)},
+ 'PDL' )
                                    ],
                         'gList' => bless( do{\(my $o = 143207224)}, '
+PDL' ),
                         'area' => 28,
                         'origin' => bless( do{\(my $o = 143321728)}, 
+'PDL' ),
                         'shape' => bless( do{\(my $o = 135712552)}, '
+PDL' ),
                         'mList' => bless( do{\(my $o = 143299624)}, '
+PDL' ),
                         'centre' => bless( do{\(my $o = 143319144)}, 
+'PDL' )
                       },
                       .
                       .
                       .
                     ],
          'time' => 26,
          'N' => 10,
          'x' => bless( do{\(my $o = 143273584)}, 'PDL' ),
          'totGrainActual' => 5,
          'NGrain' => bless( do{\(my $o = 143299000)}, 'PDL' ),
          'grainMean' => 40,
          'M' => 20,
          'sumArea2' => 8248,
          'grainSigmaByMean' => '0.17606816861659',
          'sumArea' => 200,
          'grainSigma' => '7.0427267446636',
          'name' => 'Voronoi_20x10_5_0.2',
           .
           .
           .

[download]
The $VAR1->{x} field and $VAR1->{o} fields should both be 20x10 PDL's, and they're somehow saved as a very short section of code. Previously, when I tried to recreate the structure in memory, I got a segmentation fault error. And after some more experimenting, I'm now getting: 
Fatal error: argument is probably not a piddle, or magic no overwritte
+n. You're in trouble, guv: 143374912 143324128 135000880

[download]
Any suggestions on how I can save this large structure to disk and get it back? The saved file is coming out 3MB in size. I would actually prefer a more compact and faster to write & read format. So if someone knows a better way to do it, please help. Thx

In reply to Difficulty saving PDL's to disk with Data::dumper by Chah

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