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Description
In LaTeX, the third parameter (bar thickness) togenfrac requires a unit, but Matplotlib's mathtext parser does not accept it. This causes an inconsistency in the docs between Matplotlib and LaTeX, cfhttps://github.com/matplotlib/matplotlib/pull/18948/files#diff-9d1b2ab4b8a5e77dc635425c7e7ec00af5667d684d0809e46a973185e8f9918fR97
Code for reproduction
importmatplotlib.pyplotaspltplt.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", line1883, in__call__returnself.func(*args) File"/usr/lib64/python3.8/tkinter/__init__.py", line804, incallit func(*args) File"/usr/lib64/python3.8/site-packages/matplotlib/backends/_backend_tk.py", line270, inidle_drawself.draw() File"/usr/lib64/python3.8/site-packages/matplotlib/backends/backend_tkagg.py", line9, indrawsuper(FigureCanvasTkAgg,self).draw() File"/usr/lib64/python3.8/site-packages/matplotlib/backends/backend_agg.py", line393, indrawself.figure.draw(self.renderer) File"/usr/lib64/python3.8/site-packages/matplotlib/artist.py", line38, indraw_wrapperreturn draw(artist, renderer,*args,**kwargs) File"/usr/lib64/python3.8/site-packages/matplotlib/figure.py", line1735, indraw mimage._draw_list_compositing_images( File"/usr/lib64/python3.8/site-packages/matplotlib/image.py", line137, in_draw_list_compositing_images a.draw(renderer) File"/usr/lib64/python3.8/site-packages/matplotlib/artist.py", line38, indraw_wrapperreturn draw(artist, renderer,*args,**kwargs) File"/usr/lib64/python3.8/site-packages/matplotlib/axes/_base.py", line2630, indraw mimage._draw_list_compositing_images(renderer,self, artists) File"/usr/lib64/python3.8/site-packages/matplotlib/image.py", line137, in_draw_list_compositing_images a.draw(renderer) File"/usr/lib64/python3.8/site-packages/matplotlib/artist.py", line38, indraw_wrapperreturn draw(artist, renderer,*args,**kwargs) File"/usr/lib64/python3.8/site-packages/matplotlib/text.py", line685, indraw bbox, info, descent= textobj._get_layout(renderer) File"/usr/lib64/python3.8/site-packages/matplotlib/text.py", line299, in_get_layout w, h, d= renderer.get_text_width_height_descent( File"/usr/lib64/python3.8/site-packages/matplotlib/backends/backend_agg.py", line209, inget_text_width_height_descentself.mathtext_parser.parse(s,self.dpi, prop) File"/usr/lib64/python3.8/site-packages/matplotlib/mathtext.py", line3354, inparse box=self._parser.parse(s, font_output, fontsize, dpi) File"/usr/lib64/python3.8/site-packages/matplotlib/mathtext.py", line2583, inparseraiseValueError("\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 passing3 instead of3pt, though possibly slightly different spacing, as I'm not sure in what unit we treat the 3 right now.