use strict;
use GD::Graph::lines;
#use GD::Graph;
my @data = ( 
    ["1st","2nd","3rd","4th","5th","6th","7th", "8th", "9th"],
    [    1,    2,    5,    6,    3,  1.5,    1,     3,     4],
    [ sort { $a <=> $b } (1, 2, 5, 6, 3, 1.5, 1, 3, 4) ]
);
my $my_graph = GD::Graph::lines->new(400, 300);

$my_graph->set( 
      x_label           => 'X Label',
      y_label           => 'Y label',
      title             => 'Some simple graph',
      y_max_value       => 8,
      y_tick_number     => 8,
      y_label_skip      => 2 
) or die $my_graph->error;

my $gd = $my_graph->plot(\@data) or die $my_graph->error;
open(IMG, '>file.png') or die $!;
binmode IMG;
print IMG $gd->png;
close IMG;