Thanks for the suggestions, Darren.
I spent some time going through older revisions of Matplotlib (and
Numpy and SciPy) and it turns out that it isn't an issue with
Matplotlib as I originally suspected, but rather how I went out
updated an imshow-based plot. Previously I was attempting to plot an
image first, then set then use the result to create a
FigureCanvasQTAgg instance:
import matplotlib.pyplot as plt
figure = plt.figure()
self.axes = figure.add_subplot(111)
self.axes.imshow(...)
self.figure = figure
FigureCanvasQTAgg.__init__(self, self.figure)
This works in some environments and it happened to work at the time I
originally developed the code, but is not the best way to do things.
A better way is to first instantiate a Figure instance:
self.figure = Figure()
self.axes = self.figure.add_subplot(111)
self.axes.imshow(...)
FigureCanvasQTAgg.__init__(self, self.figure)
For now this seems to do the trick. If anyone knows of a better way to
do things, please let me know.
Thanks!
Keith
On Mon, Mar 12, 2012 at 11:57 AM, Darren Dale <dsdal...@gmail.com> wrote:
>
> Have you tried running with older checkouts on the master branch to
> see when the problem was introduced? You can do something like:
>
> git log --oneline --graph lib/matplotlib/backends/backend_qt4.py # or
> backend_qt4agg.py
>
> to see what commits were applied to master but not v1.0.x. Try
> bisecting the commit history to find the commit that introduced the
> problem (which you might want to describe in a little more detail.)
>
> Darren
>
> On Mon, Mar 12, 2012 at 10:13 AM, Keith Hughitt <keith.hugh...@gmail.com>
> wrote:
> > *bump*
> >
> > Anyone else encountering this problem?
> >
> >
> > On Tue, Mar 6, 2012 at 4:06 PM, Keith Hughitt <keith.hugh...@gmail.com>
> > wrote:
> >>
> >> Hey all,
> >>
> >> Anyone know what has changed from Maplotlib 1.0.x to 1.1.x that might
> >> cause a PyQt4 application to segfault?
> >>
> >> Here is the code I'm working
> >> on: https://github.com/sunpy/sunpy/blob/master/doc/examples/rgb_composite/rgb_composite.py
> >>
> >> It works fine with earlier versions of Matplotlib (0.99 and 1.0.x) but
> >> when I try and run the demo with Matplotlib 1.1 I get a segfault.
> >>
> >> Any ideas?
> >>
> >> Thanks,
> >> Keith
> >>
> >
> >
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