#!/usr/bin/perl -w
use strict;
use Chart::Gnuplot;
# Create the chart object
my $chart = Chart::Gnuplot->new(
output => "surface.png",
ztics => undef,
hidden3d => '',
imagesize => '0.45,0.45',
);
# Data set object
my $dataSet = Chart::Gnuplot::DataSet->new(
func => "x**2 - 2*(y**2)",
);
# Plot the graph
$chart->plot3d($dataSet);