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I would like to have a matplotlib plot in my Latex document that uses the same font as the rest of the document. I read in the matplotlib documentation that if you set the rc parameter 'usetex' to true it will use the 'Computer Modern' font, which is also the standard for Latex. Trying this gave me the following result.

Imported matplotlib figure in Latex

The title of the plot is generated by matplotlib, the caption by the Latex document. As you can see, the font doesn't match. I think both use 'Computer Modern', but not the same font family. The title (by matplotlib) might be something like 'Sans Serif Roman', while the caption (by the Latex document) is something like 'Serif Roman'. I tried to change the font family with the following:

plt.title("Lorem Ipsum", family='serif', fontsize=20)

But it has no effect as long usetex is activated. I also tried it with fontdict, but it also did not change the font in any way. Also writing the name of a font directly to family does not work.

Is there any way to get the same font as in the Latex document?

Dirk Pitt
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    You may want to look at including the preamble in matplotlib's settings to have prepared images and document closer together. – snwflk Jul 29 '22 at 12:23
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    Does this answer your question? [How to obtain the same font(-style, -size etc.) in matplotlib output as in latex output?](https://stackoverflow.com/questions/17687213/how-to-obtain-the-same-font-style-size-etc-in-matplotlib-output-as-in-latex) – snwflk Jul 29 '22 at 12:23
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    Over time, I've moved away from using prepared images from matplotlib to including plots etc. directly in the LaTeX document with the help of the `tikz` package. That way, you're guaranteed to have exactly the same font appearance. If stuff takes too long to render, check out `tikzexternal`, which caches tikz graphics. – snwflk Jul 29 '22 at 12:28
  • @snwflk Thanks! I tried with tikz too, but I had several problems, so I went back to pdf import. I will definitely check out tikzexternal if I try it again. – Dirk Pitt Jul 29 '22 at 12:45

2 Answers2

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Ok, after speding yesterday half a day with searching a solution, I now stumbled over it 5 minutes after asking the question.

Solution:

plt.rcParams['font.family'] = 'serif'

For some reason when usetex=True, setting the fontfamily works only globally.

Dirk Pitt
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import matplotlib.pyplot as plt

plt.style.use('classic')
plt.style.use('dark_background')

Example:

import matplotlib.pyplot as plt
import numpy as np
from scipy import special

plt.style.use('classic')
plt.style.use('dark_background')


s = np.linspace(-50,40,150)
p0 = special.polygamma(0,s)
p1 = special.polygamma(1,s)
p2 = special.polygamma(2,s)

plt.plot(s,p2,linewidth=1,c='blue')
plt.plot(s,p1,linewidth=1,c='green')
plt.plot(s,p0,linewidth=1,c='red')
plt.ylim(-100,100)

plt.annotate(r'$\psi^{n}(s)=\frac{d^{n}}{dx^{n}}\ln\Gamma(s)$',xy=(5,-25),size=20,fontweight='bold')

plt.annotate(r'$\psi^{n}(s)=(-1)^{n+1}n!\zeta(n+1,s)$'+'\n'+'$\{s \in \mathbb{N} : s \geq 1\}$',xy=(1,-75),size=15,fontweight='bold')

plt.axhline(y=0,color='white',linewidth=.5)
plt.axvline(x=0,color='white',linewidth=.5)
plt.grid(lw=.5,ls=':')
plt.xlabel('s',fontweight='bold')
plt.ylabel(r'$\psi^{n}(s)$')
Reinan Br
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  • As it’s currently written, your answer is unclear. Please [edit] to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community Jul 06 '23 at 19:41