I am trying to use the GD::Graph module to plot a chart that will have militay hour number on the x-axis and a count on the y-axis. I have indexes for my hash table for 'hour' and 'count'. I would like to use the GD::Graph::lines function. Below is the example code that I am trying to plot my data but it gives me errors. 
# This is the original data from the perldoc examples
# @data=(["1st","2nd","3rd"],
#        [9,4,7]);


#  I have a hash table with $data[$index]{'hour'} and $data[$index]{'c
+ount'}
#
$graph= GD::Graph::lines->new(400,300);
$graph->set(
    x_label => 'Hour',
    y_label => 'Transaction Volume',
    title => 'Number of transactions per hour',
    y_max_value => 20,
    y_label_skip => 1,
    y_tick_number => 1);

    $gd = $graph->plot(\@data);

    open (IMG,'>file.png') or die $!;
    binmode IMG;
    print IMG $gd->png;
    close IMG;

[download]
Any ideas? Thanks in advance!!

In reply to Question about using hash indexes with GD::Graph by vonman

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