[Bug]: ax.plot(x,y) disappears after changing y_scale #25124

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1. tacaswell commented on Feb 1, 2023

   

   tacaswell

   on Feb 1, 2023

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   I can confirm that this is a regression between 3.6.2 and 3.6.3, is still present in 3.7.0rc1 and is not a pdf related problem.

   Slightly modified reproduction script:

   import numpy as np
   import matplotlib
   import matplotlib.pyplot as plt
   
   samples = np.random.normal(size = 1000)
   x = np.linspace(-5,5,1000)
   fig, ax = plt.subplots()
   ax.set_title(f'{matplotlib.__version__}')
   ax.hist(samples, log = True, density = True)
   ax.plot(x, np.exp(-x**2/2)/np.sqrt(2*np.pi))
   fig.savefig('/tmp/log.pdf')
   plt.pause(1)
   ax.set_yscale('linear')
   plt.pause(1)
   fig.savefig('/tmp/lin.pdf')

   Thank you for the very clear report @sterinaldi !
2. tacaswell

   added this to the v3.7.0 milestone on Feb 1, 2023
3. tacaswell

   added

   status: confirmed bug

   Release criticalFor bugs that make the library unusable (segfaults, incorrect plots, etc) and major regressions.For bugs that make the library unusable (segfaults, incorrect plots, etc) and major regressions.

   on Feb 1, 2023
4. ksunden commented on Feb 1, 2023

   

   ksunden

   on Feb 1, 2023

   Last edited by ksunden

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   bisects to 8d8d3f5 (#24684)

   which is the (manual) backport of #24654

   Also interacts with #24634, which was modifying some of the same areas of code

   Cache invalidation strikes again
5. ksunden commented on Feb 1, 2023

   

   ksunden

   on Feb 1, 2023

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   Interestingly, the original PR (#24654) explicitly mentions the "fix log/linear toggle", and states that it "clearly works fine even with this removal"
6. tacaswell commented on Feb 1, 2023

   

   tacaswell

   on Feb 1, 2023

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   It matters if there is a draw before the switch. Commenting out the save and the pause makes the linear one look correct.

   Further linear -> log works, but log -> linear does not...
7. tacaswell commented on Feb 1, 2023

   

   tacaswell

   on Feb 1, 2023

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   ok, I have a fix for this and see how to test it, PR coming soon.
8. tacaswell

   added a commit that references this issue on Feb 1, 2023

   FIX: fully invalidate TransformWrapper parents before swapping

   ...

   This issue will close once commit 58cadad is merged into the 'main' branch.

   58cadad
9. anntzer

   closed this as completedin #25126on Feb 2, 2023
10. imgbot

    added 3 commits that reference this issue on Apr 19, 2026

    FIX: fully invalidate TransformWrapper parents before swapping

    ...

    This issue will close once commit bb59e81 is merged into the 'main' branch.

    bb59e81

    FIX: fully invalidate TransformWrapper parents before swapping

    ...

    This issue will close once commit 602b491 is merged into the 'main' branch.

    602b491

    FIX: fully invalidate TransformWrapper parents before swapping

    ...

    This issue will close once commit 6e30afc is merged into the 'main' branch.

    6e30afc