BUG: Quiver must copy U, V, C args so they can't change before draw() #4250
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lib/matplotlib/tests/test_quiver.py
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pep8 is complaining about one too few new lines here.
tacaswell
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Mar 21, 2015
BUG : Quiver must copy U, V, C args so they can't change before draw()
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@efiring Is this worth back-porting to the color-overhaul branch? |
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Yes, I think it is worth backporting. I've never been 100% sure what procedure to use for this; is it OK to simply cherry-pick the commit to the appropriate branch locally, and then push to github? Is that the way you have been doing it? |
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That is what I have been doing on the premise that if I can merge someone elses PR to this branch it's kosher to merge it to an other branch. I'll take care of moving this one over. |
tacaswell
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Mar 21, 2015
BUG : Quiver must copy U, V, C args so they can't change before draw()
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back-ported as 5852d83 |
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Thank you. |
QuLogic
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Jun 24, 2021
For the same reason as Quiver in matplotlib#4250.
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The bug was revealed when a user was plotting to successive subplots inside a loop iterating through a numerical integration. U and V were references to objects that were updated inside the loop, but the figure was not drawn until the end. Therefore all panels showed the quiver of the last iteration.