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\genfrac should accept a unit for thickness #19001
Description
In LaTeX, the third parameter (bar thickness) to genfrac requires a unit, but Matplotlib's mathtext parser does not accept it. This causes an inconsistency in the docs between Matplotlib and LaTeX, cf https://github.com/matplotlib/matplotlib/pull/18948/files#diff-9d1b2ab4b8a5e77dc635425c7e7ec00af5667d684d0809e46a973185e8f9918fR97
Code for reproduction
import matplotlib.pyplot as plt
plt.text(0, 0, r'$\genfrac{(}{)}{3pt}{0}{foo}{bar}$')
plt.draw()Actual outcome
Traceback (most recent call last):
File "/usr/lib64/python3.8/tkinter/__init__.py", line 1883, in __call__
return self.func(*args)
File "/usr/lib64/python3.8/tkinter/__init__.py", line 804, in callit
func(*args)
File "/usr/lib64/python3.8/site-packages/matplotlib/backends/_backend_tk.py", line 270, in idle_draw
self.draw()
File "/usr/lib64/python3.8/site-packages/matplotlib/backends/backend_tkagg.py", line 9, in draw
super(FigureCanvasTkAgg, self).draw()
File "/usr/lib64/python3.8/site-packages/matplotlib/backends/backend_agg.py", line 393, in draw
self.figure.draw(self.renderer)
File "/usr/lib64/python3.8/site-packages/matplotlib/artist.py", line 38, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/usr/lib64/python3.8/site-packages/matplotlib/figure.py", line 1735, in draw
mimage._draw_list_compositing_images(
File "/usr/lib64/python3.8/site-packages/matplotlib/image.py", line 137, in _draw_list_compositing_images
a.draw(renderer)
File "/usr/lib64/python3.8/site-packages/matplotlib/artist.py", line 38, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/usr/lib64/python3.8/site-packages/matplotlib/axes/_base.py", line 2630, in draw
mimage._draw_list_compositing_images(renderer, self, artists)
File "/usr/lib64/python3.8/site-packages/matplotlib/image.py", line 137, in _draw_list_compositing_images
a.draw(renderer)
File "/usr/lib64/python3.8/site-packages/matplotlib/artist.py", line 38, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/usr/lib64/python3.8/site-packages/matplotlib/text.py", line 685, in draw
bbox, info, descent = textobj._get_layout(renderer)
File "/usr/lib64/python3.8/site-packages/matplotlib/text.py", line 299, in _get_layout
w, h, d = renderer.get_text_width_height_descent(
File "/usr/lib64/python3.8/site-packages/matplotlib/backends/backend_agg.py", line 209, in get_text_width_height_descent
self.mathtext_parser.parse(s, self.dpi, prop)
File "/usr/lib64/python3.8/site-packages/matplotlib/mathtext.py", line 3354, in parse
box = self._parser.parse(s, font_output, fontsize, dpi)
File "/usr/lib64/python3.8/site-packages/matplotlib/mathtext.py", line 2583, in parse
raise ValueError("\n".join(["",
ValueError:
\genfrac{(}{)}{3pt}{0}{foo}{bar}
^
Expected \genfrac{ldelim}{rdelim}{rulesize}{style}{num}{den}, found '{' (at char 8), (line:1, col:9)Expected outcome
Draws as if passing 3 instead of 3pt, though possibly slightly different spacing, as I'm not sure in what unit we treat the 3 right now.
Activity
github-actions commented on Sep 15, 2023
This issue has been marked "inactive" because it has been 365 days since the last comment. If this issue is still present in recent Matplotlib releases, or the feature request is still wanted, please leave a comment and this label will be removed. If there are no updates in another 30 days, this issue will be automatically closed, but you are free to re-open or create a new issue if needed. We value issue reports, and this procedure is meant to help us resurface and prioritize issues that have not been addressed yet, not make them disappear. Thanks for your help!