[Graph-dev] arbitrary number of data series

[Adam Pirkle]

If you take a look in Gnuplot.pm, that error message would be generated by

if (ref($user_data_options_ref) ne "HASH") {
   carp "Data options must be a hash.";
   return 0;
}

(where $user_data_options_ref is equal to your $options)

So, something must have gone wrong when you created your options hash ref.

-Adam

On Fri, Jan 02, 2004 at 12:58:35PM +0000, Ollie Cook said the following:
> Hi,
> 
> I am having some trouble using Chart::Graph::Gnuplot when wanting to plot
> a variable number of data series on the same graph.
> 
> Based on various configuration options, data is retrieved from an SQL database.
> This data is massaged into an array of 'data set elements'
> ([\%data_set_options, \@matrix]), each element representing a data series.
> 
> The number of data series depends on the number of columns returned by the SQL
> query.
> 
> The following example shows the contents of this array, with three series each
> containing two data points (for demonstration purposes):
> 
> $VAR1 = [
>           [
>             {
>               'type' => 'matrix',
>               'title' => 'Total'
>             },
>             [
>               '2003-02-19',
>               100852
>             ],
>             [
>               '2003-02-20',
>               528988
>             ]
>           ],
>           [
>             {
>               'type' => 'matrix',
>               'title' => 'External SMTP'
>             },
>             [
>               '2003-02-19',
>               89759
>             ],
>             [
>               '2003-02-20',
>               465174
>             ]
>           ],
>           [
>             {
>               'type' => 'matrix',
>               'title' => 'Internal Reinjections'
>             },
>             [
>               '2003-02-19',
>               11093
>             ],
>             [
>               '2003-02-20',
>               63814
>             ]
>           ]
>         ];
> 
> I was then hoping to be able to call gnuplot like:
> 
>   gnuplot($options, $all_series);
> 
> where $options is a hashref and $options is an arrayref to the prepared array.
> 
> However, gnuplot reports the following error when used like that:
> 
>  "Data options must be a hash."
> 
> I am guessing this is caused by me passing an arrayref of 'data set elements'
> rather than a list of 'data set elements'. Is that correct?
> 
> In any case, I've been unable to find any examples of using
> Chart::Graph::Gnuplot with arbitrary numbers of data series. If someone could
> point me in the correct direction that would be great.
> 
> Thanks,
> 
> Ollie
> 
> -- 
> Oliver Cook    Systems Administrator, Claranet UK
> ollie at uk.clara.net                  020 7903 3065
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