Matplotlib warning about no LaTeX-compatible font.

Hi,

Whenever I use this package setting

plt.style.use(["science"])
plt.style.reload_library()

I get the following warning sign multiple times when I plot anything:

matplotlib.texmanager - INFO - No LaTeX-compatible font found for the serif font family in rcParams. Using default.

Now, I have investigated a little, this warning is issued here:

https://github.com/matplotlib/matplotlib/blob/02af61b3000b93efad98f415b4a7eb330c9e46c1/lib/matplotlib/texmanager.py#L124

so it looks like it cannot found the specified font in the attribute TexManager.font_info. I have printed the font that is trying to look at, and it is “Times New Roman”, as you would expect, but indeed that font is not found in the font_info dictionary:

https://github.com/matplotlib/matplotlib/blob/02af61b3000b93efad98f415b4a7eb330c9e46c1/lib/matplotlib/texmanager.py#L62

What am I missing here? I am using:

SciencePlots: latest commite release Matplotlib: 3.3.0 OS: Manjaro 20.2 Tex: Texlive installation with these packages:

texlive-bibtexextra
texlive-core
texlive-fontsextra
texlive-formatsextra
texlive-games
texlive-humanities
texlive-latexextra
texlive-music
texlive-pictures
texlive-pstricks
texlive-publishers
texlive-science

Thank you very much for your help!

[Hsins]

Hi @arnauqb

You got that warning because the given font Times New Roman in science style can’t be found in your matplotlib cache. The Times New Roman is a font licensed to Microsoft from Monotype so you can’t find that font in your machine which runs with Linux operating system.

---

There are two steps to solve your problem:

1. Install the Times New Roman fonts on your system.

   There are two packages ttf-times-new-roman and ttf-ms-fonts in AUR (Arch User Repository) and you can install one of them by the package manager yay or yaourt in your Manjaro system.

   # Install Times New Roman Fonts with Package Manager
   $ yay -S ttf-times-new-roman     # Option 1
   $ yay -S ttf-ms-fonts            # Option 2
   
   # Clear and Regenerate Your Font Cache (System Fonts Cache)
   $ sudo fc-cache -f -v
   

2. Then clear the font cache of matplotlib.

   After installing those fonts and regenerate the cache, you can directly use them in software like PyCharm or LibreOffice but still get that warning in matplotlib. You should find out the path of the font cache of matplotlib and clear it.

   If you don’t know the path of the font cache of matplotlib. Just type python in your terminal and run the commands below in the interactive Python REPL environment.

   >>> import matplotlib as plt
   >>> plt.get_cachedir()
   '/home/hsins/.cache/matplotlib'
   

   Then clear the font cache of matplotlib by deleting that folder. (The cache would be regenerated when you run matplotlib next time)

   # Clear the Font Cache of Matplotlib (MUST REPLACE THE PATH TO WHAT YOU GOT IN PREVIOUS STEP)
   $ rm -rf /home/hsins/.cache/matplotlib
   

[Hsins]

Hi @arnauqb

In commit 86e369f, @garrettj403 have changed the font from Times New Roman to Times. If you use the newest version of SciencePlot in your machine, then it would give warnings if there is no Times font.

Would you show that warning message?