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titusjan opened this issue Nov 19, 2015 · 4 comments
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"interactive example" not working with PySide #5517

titusjan opened this issue Nov 19, 2015 · 4 comments
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Documentation
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v1.5.2

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@titusjan
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I am running the interactive example from the documentation using the Qt4Agg backend. That is, I run the following commands in a regular Python shell:

    import matplotlib.pyplot as plt
    plt.ion()
    plt.plot([1.6, 2.7])

When I put backend.qt4 : PyQt4 in my .matplotlibrc it works as expected. However, when I use backend.qt4 : PySide an empty, unresponsive window is shown.

After a bit of googling I am not so sure that the "interactive example" is supposed to work for alli interactive backends. Especially this comment by efiring indicates so. However this is in contradiction with the documentation.

Can you clarify this and/or update the documentation?

I am using OS-X 10.6.8, Python 2.7.10, Matplotlib 1.4.3, PySide 1.2.2 and PyQt 4.11.4.
@tacaswell
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Try in IPython after having run %matplotlib qt.

The issue is the bridge between the python repl event loop and the qt event loop.

@titusjan
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Yes, that works. I'm perfectly happy with using ipython --matplotlib=qt in the future but my issue is that the documentation is (likely) incorrect. Sorry if that wasn't clear.

In the interactive example section it says: "From an ordinary python prompt, or after invoking ipython with no options, try this: ...". It seems that this not always works. In the past I've often wondered what I did wrong and spend a lot of time with fruitless debugging.

@tacaswell
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Can you put in a PR that changes that to something more accurate?

@tacaswell tacaswell added this to the next major release (2.0) milestone Nov 19, 2015
@tacaswell
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The source for that section is at https://github.com/matplotlib/matplotlib/blob/master/doc/faq/usage_faq.rst You can edit it and create the pull request directly from the browser.

story645 added a commit to story645/matplotlib that referenced this issue Mar 21, 2016
@story645
Proposed fix for matplotlib#5517
72e7e7d 
Amended the documentation as suggested by @tacaswell in  matplotlib#5517
story645 added a commit to story645/matplotlib that referenced this issue Mar 21, 2016
@story645
Proposed fix for matplotlib#5517
c97f362 
Added link to what is a backend suggestion to explicitly explain that if interactivity isn't working, you need to activate an interactive backend.
@story645 story645 mentioned this issue Mar 21, 2016
Merged
tacaswell added a commit that referenced this issue Mar 21, 2016
@tacaswell
Merge pull request #6194 from story645/patch-1
d74eca5 
Documentation bug fix: #5517
@matthew-brett matthew-brett mentioned this issue Mar 21, 2016
Open
@QuLogic QuLogic modified the milestones: 1.5.2 (Critical bug fix release), 2.0 (style change major release) Mar 22, 2016
bearstrong pushed a commit to bearstrong/matplotlib that referenced this issue Apr 1, 2016
@tacaswell @bearstrong
Merge pull request matplotlib#6194 from story645/patch-1
dfacfd2 
Documentation bug fix: matplotlib#5517
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@tacaswell @QuLogic @titusjan