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Chart::GNUPlot ...Can't plot

by exploreperl (Initiate)
on Oct 25, 2013 at 07:30 UTC ( #1059602=perlquestion: print w/ replies, xml ) Need Help??
exploreperl has asked for the wisdom of the Perl Monks concerning the following question:

I get the following error while trying to plot a time series using gnu plot ** expecting 'data', 'function', 'line', 'fill', 'rectangle', 'circle', 'ellipse' or 'arrow' **

my $chart = Chart::Gnuplot->new(output =>"temp.png",title=>"RTPTSDiff + vs ScaledPayloadSize",style => "points",xlabel=>"PacketArrivalTime m +s",ylabel=>"ScaledPayloadsize"); my $dataset = Chart::Gnuplot::DataSet->new(xdata => \@rtppackettimeinm +s, ydata => \@scaledpayloadsize);
Any ideas on what is wrong?

Comment on Chart::GNUPlot ...Can't plot
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Re: Chart::GNUPlot ...Can't plot
by Anonymous Monk on Oct 25, 2013 at 08:02 UTC

    Says ...expecting 'data',... but your code only has xdata ...

    So I think thats it :)

Re: Chart::GNUPlot ...Can't plot
by keszler (Priest) on Oct 25, 2013 at 08:35 UTC
    What version of Gnuplot do you have installed? That error message would seem to indicate a Gnuplot older than 4.6.
Re: Chart::GNUPlot ...Can't plot
by VinsWorldcom (Priest) on Oct 25, 2013 at 13:18 UTC

    Your 'style => "points"' is misplaced. If you want points to indicate your data on the chart, you need to put that in the dataset object, not the chart object.

    This works for me:

    use strict; use warnings; use Chart::Gnuplot; my @rtppackettimeinms = (1,2,3,4,5); my @scaledpayloadsize = (1,2,3,4,5); my $chart = Chart::Gnuplot->new( terminal=>'dumb', # output =>"temp.png", title=>"RTPTSDiff vs ScaledPayloadSize", xlabel=>"PacketArrivalTime ms", ylabel=>"ScaledPayloadsize" ); my $dataset = Chart::Gnuplot::DataSet->new( style => "points", xdata => \@rtppackettimeinms, ydata => \@scaledpayloadsize ); $chart->plot2d($dataset);

    NOTE: I commented 'output =>"temp.png"' and replaced with 'terminal=>dumb' to get the brilliant ASCII art you see below proving I get output and not the error you're seeing.

    VinsWorldcomC:\Users\VinsWorldcom\tmp> 1059602.pl
    
                             RTPTSDiff vs ScaledPayloadSize
    
        5 ++-------+-------+--------+--------+-------+--------+-------+-------+A
          +        +       +        +        +       +        +       +        +
      4.5 ++                                                                  ++
          |                                                                    |
        4 ++                                                  A               ++
          |                                                                    |
      3.5 ++                                                                  ++
          |                                                                    |
        3 ++                                 A                                ++
          |                                                                    |
          |                                                                    |
      2.5 ++                                                                  ++
          |                                                                    |
        2 ++               A                                                  ++
          |                                                                    |
      1.5 ++                                                                  ++
          +        +       +        +        +       +        +       +        +
        1 A+-------+-------+--------+--------+-------+--------+-------+-------++
          1       1.5      2       2.5       3      3.5       4      4.5       5
                                  PacketArrivalTime ms
    
    
    

    BTW, LOVE Chart::Gnuplot! You may also deduce from the command prompt above, I'm doing this on Windows 7 x64 with Strawberry Perl 5.16.1 and gnuplot 4.6 patchlevel 3.

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