matplotlib-users

[Matplotlib-users] matplotlib WX and Qt4Agg backends

[TheLonelyStar <na...@lo...>]

Hi,

I have installed matplotlib with the "WX" and the "Qt4Agg" backend. Both
have problems:

with WX backend, I can plot something. But when I close the window and try
to plot again, nothing happens (no window opens).

with Qt4Agg I can plot something. But when I close the window and try to
plot again, I get the error I posted below.

Can something be done about one if these problems?

Thanks!
Nathan


The Error:

RuntimeError                              Traceback (most recent call last)

/net/gorgonzola/storage/nhuesken/svn/ActiveLearning/SVM/ModelSelection/Ergebnisse/<ipython
console> in <module>()

/net/gorgonzola/storage/nhuesken/svn/ActiveLearning/SVM/ModelSelection/Ergebnisse/plot.pyc
in plot(filename, line_list, name_list, reference)
      6         for i in xrange(len(line_list)):
      7                
plt.plot(m[:,reference],m[:,line_list[i]],label=name_list[i])
      8         plt.legend(loc='best')
----> 9         plt.show()
     10 

/export/home/nhuesken/usr/lib/python2.6/site-packages/matplotlib/backends/backend_qt4.pyc
in show()
     61     """
     62     for manager in Gcf.get_all_fig_managers():
---> 63         manager.window.show()
     64 
     65     if DEBUG: print 'Inside show'

RuntimeError: underlying C/C++ object has been deleted

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Re: [Matplotlib-users] matplotlib WX and Qt4Agg backends

[Taro S. <ub...@gm...>]

TheLonelyStar wrote:
> 
> 
> /net/gorgonzola/storage/nhuesken/svn/ActiveLearning/SVM/ModelSelection/Ergebnisse/plot.pyc
> in plot(filename, line_list, name_list, reference)
>       6         for i in xrange(len(line_list)):
>       7                
> plt.plot(m[:,reference],m[:,line_list[i]],label=name_list[i])
>       8         plt.legend(loc='best')
> ----> 9         plt.show()
>      10 
> 
> 

Are you calling plt.show() more than once within a script?  If so, I was
having a similar issue, but after reading this FAQ entry:

  http://matplotlib.sourceforge.net/faq/howto_faq.html#use-show

I realized that the specific usage of show() is not supported (yet);
plt.show() can only be used once within a script.  Out of luck!  

I hope there is a resolution one way or the other, since it will make
matplotlib so much more useful than it already is.

Cheers,
Taro

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Re: [Matplotlib-users] matplotlib WX and Qt4Agg backends

[Darren D. <dsd...@gm...>]

On Thu, Nov 12, 2009 at 12:13 PM, Taro Sato <ub...@gm...> wrote:
>
>
> TheLonelyStar wrote:
>>
>>
>> /net/gorgonzola/storage/nhuesken/svn/ActiveLearning/SVM/ModelSelection/Ergebnisse/plot.pyc
>> in plot(filename, line_list, name_list, reference)
>>       6         for i in xrange(len(line_list)):
>>       7
>> plt.plot(m[:,reference],m[:,line_list[i]],label=name_list[i])
>>       8         plt.legend(loc='best')
>> ----> 9         plt.show()
>>      10
>>
>>
>
> Are you calling plt.show() more than once within a script?  If so, I was
> having a similar issue, but after reading this FAQ entry:
>
>  http://matplotlib.sourceforge.net/faq/howto_faq.html#use-show
>
> I realized that the specific usage of show() is not supported (yet);
> plt.show() can only be used once within a script.  Out of luck!
>
> I hope there is a resolution one way or the other, since it will make
> matplotlib so much more useful than it already is.

The problem with the Qt4 backend was already reported on this (or the
developers) list. It is a regression in PyQt4 or sip and will be fixed
in the next release.

Darren