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
If I replace import qt by import PyQt4, I get another error :
/usr/lib/python2.4/site-packages/matplotlib/backends/backend_qt.py
22 DEBUG = False
23
---> 24 cursord = {
25 cursors.MOVE : qt.Qt.PointingHandCursor,
26 cursors.HAND : qt.Qt.WaitCursor,
It is a well known problem ?
What could I do to help to debug that?
Xavier
···
--
############################################
Xavier Gnata
CRAL - Observatoire de Lyon
9, avenue Charles Andr�
69561 Saint Genis Laval cedex
Phone: +33 4 78 86 85 28
Fax: +33 4 78 86 83 86
E-mail: gnata@...419...
############################################
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.
···
On Saturday 11 August 2007 8:15:41 am Xavier Gnata wrote:
Darren Dale 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]:
···
On Saturday 11 August 2007 8:15:41 am Xavier Gnata wrote:
---------------------------------------------------------------------------
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
....
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 :
[...]
It looks like that the ranges of the sliders are checked in a wrong way.
It may be due to numerical rounding issues.
Unfortunately I have my hands full at work, so I don't know when I will be
able to look into this. I would need more information before I could start
anyway: a simple script and a list of steps that reproduces the problem, and
does it only occur with the qt4 backend.
Darren
···
On Sunday 12 August 2007 07:05:38 pm Xavier Gnata wrote:
Darren Dale wrote:
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 :
[...]
It looks like that the ranges of the sliders are checked in a wrong way.
It may be due to numerical rounding issues.
Unfortunately I have my hands full at work, so I don't know when I will be able to look into this. I would need more information before I could start anyway: a simple script and a list of steps that reproduces the problem, and does it only occur with the qt4 backend.
Darren
Using Qt4Agg as backend :
import pylab
pylab.plot([1,2])
Then click on the "subplot configuration tool"
Move the "left" slider to the right end on the slider.
Python crashes because :
ValueError: left cannot be >= right
Using the TkAgg backend, I'm not able to reporduce the bug because it is not possbile to move the sliders to get left>=right (so there is no bug here :))
I had a quick look to the code and it looks like it is quite simple to fix that adding in backend_qt4.py a logic like:
if left>=right: left=right-right/1000.
The main problem is that I'm not sure to add this fix at the best place in the code.
Could someone else have a look?
Xavier
···
On Sunday 12 August 2007 07:05:38 pm Xavier Gnata wrote:
--
############################################
Xavier Gnata
CRAL - Observatoire de Lyon
9, avenue Charles Andr�
69561 Saint Genis Laval cedex
Phone: +33 4 78 86 85 28
Fax: +33 4 78 86 83 86
E-mail: gnata@...419...
############################################
This should be fixed in svn 3709. Thank you for the report and the suggested
fix. In the future, please try to provide a little more context for your
patch, the file is 550 lines long.
Darren
···
On Tuesday 14 August 2007 09:14:54 am Xavier Gnata wrote:
Darren Dale wrote:
> On Sunday 12 August 2007 07:05:38 pm Xavier Gnata wrote:
>> 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 :
>
> [...]
>
>> It looks like that the ranges of the sliders are checked in a wrong way.
>> It may be due to numerical rounding issues.
>
> Unfortunately I have my hands full at work, so I don't know when I will
> be able to look into this. I would need more information before I could
> start anyway: a simple script and a list of steps that reproduces the
> problem, and does it only occur with the qt4 backend.
>
> Darren
Using Qt4Agg as backend :
import pylab
pylab.plot([1,2])
Then click on the "subplot configuration tool"
Move the "left" slider to the right end on the slider.
Python crashes because :
ValueError: left cannot be >= right
Using the TkAgg backend, I'm not able to reporduce the bug because it is
not possbile to move the sliders to get left>=right (so there is no bug
here :))
I had a quick look to the code and it looks like it is quite simple to
fix that adding in backend_qt4.py a logic like:
if left>=right: left=right-right/1000.
The main problem is that I'm not sure to add this fix at the best place
in the code.
