I've never had any luck using xdata, ydata, zdata for 3D plots; I can't work out what's supposed to be in each array, and the documentation isn't helpful.

For 3D plots, I always use points instead - you may have to munge the data in Perl a bit first, but at least it works. The following is an example based on the 'Valley of the Gnu' data in the Gnuplot manual:

use strict;
use warnings;
use Chart::Gnuplot;

my (@x,@y,@data); #data is initialized.

@data = (
         [0, 0, 10],
         [0, 1, 10],
         [0, 2, 10],
         [1, 0, 10],
         [1, 1, 5],
         [1, 2, 10],
         [2, 0, 10],
         [2, 1, 1],
         [2, 2, 10],
         [3, 0, 10],
         [3, 1, 0],
         [3, 2, 10],
        );

my $chart = Chart::Gnuplot->new(
    output => "test1.png",
    title  => "3D plot from arrays of x, y and z coordinates",
    xlabel => 'x',
    ylabel => 'y',
);
#$chart->set(view => (180,180,1,1');                                  
+           

my $dataSet = Chart::Gnuplot::DataSet->new(
    points => \@data,
);

$chart->plot3d($dataSet);

[download]

Where the 3 element array refs are [xcoord, ycoord, zcoord] and the x's are fixed while you iterate through the y's

In reply to Re: 2d contour plot using Chart::Gnuplot by Myrddin Wyllt
in thread 2d contour plot using Chart::Gnuplot by Ppeoc

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