Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

Hi all, I have successful created graphs using GD before, however, is it possible to identify the peaks and label the coordinates on the graph? Is this a math* og graph* module? Thanks

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Re: creating graphs
by holli (Abbot) on May 17, 2005 at 14:12 UTC
    A quick cpan search yields Chart::Graph, which has a interface to the mighty Gnuplot. I never used it, but it may be worth a look.


    holli, /regexed monk/
[reply]

      I have used Chart::Graph before, with excellent success. It helps to know gnuplot fairly well first (you can read a good guide). There is a bit of a learning curve. Gnuplot and Chart::Graph are very powerful; as a result, it can sometimes take a bit of study and trial to get exactly what you want.

      Of course, the upshot is that you can usually get exactly what you want.

      The Eightfold Path: 'use warnings;', 'use strict;', 'use diagnostics;', perltidy, CGI or CGI::Simple, try the CPAN first, big modules and small scripts, test first.

[reply]
Re: creating graphs
by monkfan (Curate) on May 17, 2005 at 14:07 UTC
    AFAIK, not directly. For finding min/max you can use max-min function List::Util module on the array which you use for plotting. 
    use List::Util qw(max min sum);

    [download]
    As for the labels. I thought you it's you who put them in 
    use GD::Graph::lines;
my $my_graph = new GD::Graph::lines();
$my_graph->set( 
               x_label => 'Label X',
               y_label => 'Label Y',
               title => 'Your Title');

    [download]
    Regards,
    Edward
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[d/l]
[select]
      sorry, i mean labelling the peaks. perhaps place a number next to each peak on the graph
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Re: creating graphs
by ghenry (Vicar) on May 17, 2005 at 14:59 UTC
[reply]
[d/l]

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