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Get Mathtext \times symbol from cmsy10 when using cmr10.#23702

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timhoffm merged 2 commits intomatplotlib:mainfrom
tfpf:cmr10_cmsy10_substitutions
Oct 6, 2022
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Get Mathtext \times symbol from cmsy10 when using cmr10.#23702
timhoffm merged 2 commits intomatplotlib:mainfrom
tfpf:cmr10_cmsy10_substitutions

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@tfpf tfpf commented Aug 22, 2022

PR Summary

Fixes #10029.

import matplotlib.pyplot as plt
plt.rcdefaults()
plt.rc('font', family=['cmr10'])
plt.rc('mathtext', fontset='cm')
plt.rc('axes.formatter', use_mathtext=True)
plt.semilogy([-0.03, 0.05], [0.3, 0.05])
plt.show()

CM_multiplication_symbol

I felt that having all glyph fixes in the same place would result in cleaner code. This will also be easy to extend if, in the future, we plan to add more glyph substitutions.

PR Checklist

Tests and Styling

  • Has pytest style unit tests (and pytest passes).
  • Is Flake 8 compliant (install flake8-docstrings and run flake8 --docstring-convention=all).

Documentation

  • [N/A] New features are documented, with examples if plot related.
  • [N/A] New features have an entry in doc/users/next_whats_new/ (follow instructions in README.rst there).
  • [N/A] API changes documented in doc/api/next_api_changes/ (follow instructions in README.rst there).
  • [N/A] Documentation is sphinx and numpydoc compliant (the docs should build without error).

oscargus
oscargus approved these changes Aug 22, 2022
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One may consider a test. but I cannot really tell what would be the simplest test as a normal text with `\times' does already work.

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tfpf commented Aug 22, 2022

I think testing this isn't straightforward, since the missing multiplication sign logs a warning, but doesn't raise a user warning. (Otherwise, something similar to #20235 could be used to detect it.)

One thing I missed: cmr10_cmsy10_substitutions should probably be private; the way it is used seems to be an implementation detail.

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anntzer commented Aug 22, 2022

Perhaps https://docs.pytest.org/en/7.1.x/how-to/logging.html#caplog-fixture can help.

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oscargus commented Aug 22, 2022

I was more thinking about testing that the multiplication sign shows up (instead of ¤), rather than the warning thing.

@tfpf tfpf force-pushed the cmr10_cmsy10_substitutions branch from ba3891d to 077ea7c Compare August 22, 2022 16:35
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tfpf commented Aug 22, 2022 •
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I was more thinking about testing that the multiplication sign shows up (instead of ¤), rather than the warning thing.

I think this would require an image comparison test? I could add it if required.

tfpf
tfpf commented Aug 22, 2022
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tfpf commented Aug 23, 2022

Strange. How did the code coverage decrease. There are no uncovered lines reported in the diff.

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oscargus commented Aug 24, 2022

I do not really understand how that test works, but it does fail from time to time, so no worries about it. (Except for maybe people not reviewing as the build "fails" anyway...)

@oscargus oscargus added this to the v3.7.0 milestone Aug 30, 2022
@tfpf tfpf force-pushed the cmr10_cmsy10_substitutions branch from 48192cc to f53301d Compare October 4, 2022 18:11
@timhoffm timhoffm merged commit 7f758c6 into matplotlib:main Oct 6, 2022
@tfpf tfpf deleted the cmr10_cmsy10_substitutions branch October 6, 2022 16:03
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\times in minor ticklabels not recognized due to \mathdefault

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