Re: [Gnuplot-py-users] Using a list or tuple inside g.plot() gives errors

[Juho S. <juh...@as...>]

Hi,

I think g.plot() eats Gnuplot.Data objects, not lists. 

So you can have g.plot(data1, data2, ... dataN)
but not g.plot([data1, data2, ... dataN])

Copies of all input to g.plot is added to g.itemlist... after the command 
above you have g.itemlist as [data1, data2, ..., dataN].

To add a line to the plot after g.plot(data) you could use 

newdata = Gnuplot.Data(whateveryouhave)
g.replot(newdata)

Now the itemlist would be [data1, data2, ..., dataN, newdata].

The way I remove stuff from the itemlist is a bit ugly.

If you know the position of the unwanted item in the datalist (here 
assumed 1), you can do

del g.itemlist[1]

This does not delete you data, only the copy stored in the itemlist.
After del, the itemlist would be [data1, data3, ..., dataN, newdata] 
Then use

g.refresh() 

to update the plot and data2 is no longer visible. For this you need your 
own bookkeeping on the data in itemlist, to know the indices. If the 
itemlist goes empty you might get trouble.

--

   Juho Schultz

   e-mail: juh...@as...
   www.astro.helsinki.fi/~jschultz
   Observatory
   P.O. Box 14
   FIN-00014 University of Helsinki
   FINLAND

On Thu, 30 Jun 2005, Steven Waldauer wrote:

>
>I have a pretty simple script working right now, and I'm still  
>relatively new to python so if I'm going at this in a stupid way,  
>please let me know.
>
>right now it has the following:
>
>            a_mag = Gnuplot.Data(w, cols=(1,6), inline=1)
>            a_mag.set_option(title='Amide Dipole')
>            a_mag.set_option(with='lines')
>
>            mags.append(a_mag)
>
>             s_mag = Gnuplot.Data(w, cols=(1,10), inline=1)
>             s_mag.set_option(title='Side Chain Dipole')
>             s_mag.set_option(with='lines')
>
>            mags.append(s_mag)
>
>when I use the command:
>             g.plot(a_mag, s_mag)
>
>everything works fine. I would like however to add or remove certain  
>plots from within the script, but alas the command:
>
>             g.plot(mags)
>
>or
>             g.plot(tuple(mags))
>
>does not work. I get the following error messages:
>
>Traceback (most recent call last):
>   File "./fasttest.py", line 215, in ?
>     g.plot(mags)
>   File "/usr/local/lib/python2.4/site-packages/Gnuplot/_Gnuplot.py",  
>line 273, in plot
>     self._add_to_queue(items)
>   File "/usr/local/lib/python2.4/site-packages/Gnuplot/_Gnuplot.py",  
>line 243, in _add_to_queue
>     self.itemlist.append(PlotItems.Data(item))
>   File "/usr/local/lib/python2.4/site-packages/Gnuplot/ 
>PlotItems.py", line 513, in Data
>     set = utils.float_array(set[0])
>   File "/usr/local/lib/python2.4/site-packages/Gnuplot/utils.py",  
>line 36, in float_array
>     return Numeric.asarray(m, Numeric.Float32)
>   File "/usr/local/lib/python2.4/site-packages/Numeric/Numeric.py",  
>line 134, in asarray
>     return multiarray.array(a, typecode, copy=0, savespace=savespace)
>AttributeError: _InlineFileItem instance has no attribute '__float__'
>
>Any suggestions?
>
>Thanks for any help,
>
>Steve
>
>
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