Darren Dale wrote:
> On Saturday 11 August 2007 8:15:41 am Xavier Gnata wrote:
>
>> Hi,
>>
>> Using pylab svn, the qt backend is broken.
>>
>> import pylab fails :
>>
>> /usr/lib/python2.4/site-packages/matplotlib/backends/backend_qtagg.py
>> 11
>> 12 from backend_agg import FigureCanvasAgg
>> ---> 13 from backend_qt import qt, FigureManagerQT, FigureCanvasQT,\
>> 14 show, draw_if_interactive, backend_version, \
>> 15 NavigationToolbar2QT
>>
>> /usr/lib/python2.4/site-packages/matplotlib/backends/backend_qt.py
>> 15 from matplotlib.widgets import SubplotTool
>> 16
>> ---> 17 import qt
>> 18
>> 19 backend_version = "0.9.1"
>>
>> ImportError: No module named qt
>>
>
> That means you dont have PyQt-3 installed on your machine.
>
>
>> If I replace import qt by import PyQt4
>>
>
> dont!
>
>
>> , I get another error :
>>
>
> If you want to use PyQt4, you should set your backend to qt4agg instead of
> qtagg.
>
OK my matplotlibrc was out of date. Now it works but I have found
another but playing with the sliders of the backend:
As the log is quite long, here are only the most relevant parts :
imshow(a)
Out[7]: <matplotlib.image.AxesImage instance at 0xb262a8cc>
(play with the sliders of the qt4agg backend)
In [8]:
---------------------------------------------------------------------------
exceptions.ValueError Python 2.4.4:
/usr/bin/python
Mon Aug 13 00:58:56 2007
A problem occured executing Python code. Here is the sequence of function
calls leading up to the error, with the most recent (innermost) call last.
/usr/lib/python2.4/site-packages/matplotlib/backends/backend_qt4.py in
funcleft(self=<matplotlib.backends.backend_qt4.SubplotToolQt object>,
val=900)
/usr/lib/python2.4/site-packages/matplotlib/figure.py in
update(self=<matplotlib.figure.SubplotParams instance>,
left=0.90000000000000002, bottom=None, right=None, top=None,
wspace=None, hspace=None)
71 self._update_this('top', top)
72 self._update_this('wspace', wspace)
73 self._update_this('hspace', hspace)
74
75 def reset():
76 self.left = thisleft
77 self.right = thisright
78 self.top = thistop
79 self.bottom = thisbottom
80 self.wspace = thiswspace
81 self.hspace = thishspace
82
83 if self.validate:
84 if self.left>=self.right:
85 reset()
---> 86 raise ValueError('left cannot be >= right')
global ValueError = undefined
87
88 if self.bottom>=self.top:
89 reset()
90 raise ValueError('bottom cannot be >= top')
91
92
93
94 def _update_this(self, s, val):
95 if val is None:
96 val = getattr(self, s, None)
97 if val is None:
98 key = 'figure.subplot.' + s
99 val = rcParams[key]
100
101 setattr(self, s, val)
ValueError: left cannot be >= right
**********************************************************************
Oops, IPython crashed. We do our best to make it stable, but...
It looks like that the ranges of the sliders are checked in a wrong way.
It may be due to numerical rounding issues.
Xavier
....
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