G Jones wrote:
> Hello,
> Executing the following commands from ipython --pylab produces the error
> below:
>
> ax = subplot(111)
> ax.pcolorfast(randn(100,100))
> ax.set_xlim(2000,2001)
> draw()
>
> I ran into the error in a more complicated script, but this seems to be
> a simple example to reproduce it.
> I notice if I instead use:
> ax.set_xlim(400,500)
> draw()
> I get the expected behavior, so it seems to be a combination of the
> width being smaller than the extent, and the drawing area being off screen.
Thank you. The error is actually coming from the image code, which
pcolorfast is using in this case, and it can be reproduced with imshow.
It is now fixed in the maintenance branch, and the fix will be
propagated to the trunk shortly.
Eric
>
> My matplot lib info is
>
> In [19]: matplotlib.get_backend()
> Out[19]: 'Qt4Agg'
>
> In [20]: matplotlib.__version__
> Out[20]: '1.0.svn'
>
> This version was built from SVN just a couple of days ago.
>
> Error traceback:
>
>
> ---------------------------------------------------------------------------
> ZeroDivisionError Traceback (most recent call last)
>
> /home/obs/workspace/backend/<ipython console> in <module>()
>
> /usr/local/lib/python2.6/dist-packages/matplotlib/pyplot.pyc in draw()
> 350 def draw():
> 351 'redraw the current figure'
> --> 352 get_current_fig_manager().canvas.draw()
> 353
> 354 def savefig(*args, **kwargs):
>
> /usr/local/lib/python2.6/dist-packages/matplotlib/backends/backend_qt4agg.pyc
> in draw(self)
> 128 if DEBUG: print "FigureCanvasQtAgg.draw", self
> 129 self.replot = True
> --> 130 FigureCanvasAgg.draw(self)
> 131 self.update()
> 132
>
> /usr/local/lib/python2.6/dist-packages/matplotlib/backends/backend_agg.pyc
> in draw(self)
> 313
> 314 self.renderer = self.get_renderer()
> --> 315 self.figure.draw(self.renderer)
> 316
> 317 def get_renderer(self):
>
> /usr/local/lib/python2.6/dist-packages/matplotlib/artist.pyc in
> draw_wrapper(artist, renderer, *kl)
> 44 def draw_wrapper(artist, renderer, *kl):
> 45 before(artist, renderer)
> ---> 46 draw(artist, renderer, *kl)
> 47 after(artist, renderer)
> 48
>
> /usr/local/lib/python2.6/dist-packages/matplotlib/figure.pyc in
> draw(self, renderer)
> 773
> 774 # render the axes
>
> --> 775 for a in self.axes: a.draw(renderer)
> 776
> 777 # render the figure text
>
>
> /usr/local/lib/python2.6/dist-packages/matplotlib/artist.pyc in
> draw_wrapper(artist, renderer, *kl)
> 44 def draw_wrapper(artist, renderer, *kl):
> 45 before(artist, renderer)
> ---> 46 draw(artist, renderer, *kl)
> 47 after(artist, renderer)
> 48
>
> /usr/local/lib/python2.6/dist-packages/matplotlib/axes.pyc in draw(self,
> renderer, inframe)
> 1685 if len(self.images)<=1 or
> renderer.option_image_nocomposite():
> 1686 for im in self.images:
> -> 1687 im.draw(renderer)
> 1688 else:
> 1689 # make a composite image blending alpha
>
>
> /usr/local/lib/python2.6/dist-packages/matplotlib/artist.pyc in
> draw_wrapper(artist, renderer, *kl)
> 44 def draw_wrapper(artist, renderer, *kl):
> 45 before(artist, renderer)
> ---> 46 draw(artist, renderer, *kl)
> 47 after(artist, renderer)
> 48
>
> /usr/local/lib/python2.6/dist-packages/matplotlib/image.pyc in
> draw(self, renderer, *args, **kwargs)
> 134 self.axes.get_yscale() != 'linear'):
> 135 warnings.warn("Images are not supported on
> non-linear axes.")
> --> 136 im = self.make_image(renderer.get_image_magnification())
> 137 im._url = self.get_url()
> 138 l, b, widthDisplay, heightDisplay = self.axes.bbox.bounds
>
> /usr/local/lib/python2.6/dist-packages/matplotlib/image.pyc in
> make_image(self, magnification)
> 424
> 425 # resize viewport to display
>
> --> 426 rx = widthDisplay / numcols
> 427 ry = heightDisplay / numrows
> 428 im.apply_scaling(rx*sx, ry*sy)
>
> ZeroDivisionError: float division
>
>
> ------------------------------------------------------------------------
>
> ------------------------------------------------------------------------------
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