PATCH ? Re: [Gnuplot-py-users] Plotting a variable list?

[Leonardo M. <lm...@ud...>]

Hi Nate

> I have a database query that returns a variable length list of hosts for
> which I want to plot some data about.
> How can I pass Gnuplot.plot a list of Gnuplot.Data types?

I don't think there is a way. Is that right Michael ?

I did hack Gnuplot to do what you want. Michael, could
you please take a look ? Is it safe to apply to CVS ?
It seems to work for me. Replace the "_add_to_queue'
method in _Gnuplot.py, by the following
hacked version:

#### CODE BEGINS
    def _add_to_queue(self, items):
        """Add a list of items to the itemlist (but don't plot them).

        'items' is a sequence of items, each of which should be a
        'PlotItem' of some kind, a string (interpreted as a function
        string for gnuplot to evaluate), or a Numeric array (or
        something that can be converted to a Numeric array).

        """
        def _add_item(item):
            if isinstance(item, PlotItems.PlotItem):
                self.itemlist.append(item)
            elif type(item) is types.StringType:
                self.itemlist.append(PlotItems.Func(item))
            else:
                # assume data is an array:
                self.itemlist.append(PlotItems.Data(item))

        for item in items:
            if type(item) is types.ListType:
                # assume it is a list of PlotItems
                for plot_item in item:
                _add_item(plot_item)
            else:
                # assume it is a regular PlotItem
                _add_item(item)

#### CODE ENDS

Essentially I moved the original functionality to "_add_item()",
and I chech for each "item" whether it is really a PlotItem, or
a list of PlotItems instead. Then I pass the data to "_add_item()
accordingly.

Anyways, hope this helps,
-- Leo

On Thu, 6 Nov 2003, Nate Gelbard wrote:

> Hi,
> 
> I have a database query that returns a variable length list of hosts for
> which I want to plot some data about.
> How can I pass Gnuplot.plot a list of Gnuplot.Data types?
> In the past I knew how may lines I had on the graph so I could just pass
> g.plot(gd1,gd2,gd3,gd4) .... how do I 
> make a variable length variable list?
> 
> I was trying this but got a TypeError: bad argument type for built-in
> operation
> 
>        plot_list = []
>         for i in res.keys():
>             print i
>             x = Numeric.arange(len(res[i]),typecode=Numeric.Float)
>             y = Numeric.zeros(len(res[i]))
>             for j in range(0,len(res[i])):
>                 line = res[i]
>                 y[j] = line[j][0]
>                 gd = Gnuplot.Data(x,y,title=i,smooth=smoothtype)
>                 plot_list.append(gd)
>             g.plot(plot_list)
> 
> Thanks,
> --( Nate Gelbard, QA Engineer     
> --( Tripwire, Inc., The Integrity Assurance Company