Closed
Description
The documentation says that registering the backend should work as well (or better) than use('pgf').
This breaks when using unicode because the TeX strings are handled by the default matplotlib texmanager instead of the pgf backend.
If there is no way to disable the standard texmanager when rendering using the pgf backend, the documentation should be changed to make this problem clear.
import matplotlib as mpl
#mpl.use("pgf") # works
import matplotlib.pyplot as plt
from matplotlib.backends.backend_pgf import FigureCanvasPgf # does not work
mpl.backend_bases.register_backend('pdf', FigureCanvasPgf) #
mpl.rcParams.update({
'font.family': 'serif',
'text.usetex': True,
'pgf.rcfonts': False,
'pgf.preamble': r'\usepackage{unicode-math}',
})
plt.plot([1, 2], [3, 4])
plt.xlabel(r'$α$')
plt.savefig('foo.pdf')Traceback (most recent call last):
File "baz.py", line 19, in <module>
plt.savefig('baz.pdf')
File "/usr/lib/python3.5/site-packages/matplotlib/pyplot.py", line 577, in savefig
res = fig.savefig(*args, **kwargs)
File "/usr/lib/python3.5/site-packages/matplotlib/figure.py", line 1476, in savefig
self.canvas.print_figure(*args, **kwargs)
File "/usr/lib/python3.5/site-packages/matplotlib/backends/backend_qt5agg.py", line 162, in print_figure
self.draw()
File "/usr/lib/python3.5/site-packages/matplotlib/backends/backend_qt5agg.py", line 148, in draw
FigureCanvasAgg.draw(self)
File "/usr/lib/python3.5/site-packages/matplotlib/backends/backend_agg.py", line 469, in draw
self.figure.draw(self.renderer)
File "/usr/lib/python3.5/site-packages/matplotlib/artist.py", line 59, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/lib/python3.5/site-packages/matplotlib/figure.py", line 1085, in draw
func(*args)
File "/usr/lib/python3.5/site-packages/matplotlib/artist.py", line 59, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/lib/python3.5/site-packages/matplotlib/axes/_base.py", line 2110, in draw
a.draw(renderer)
File "/usr/lib/python3.5/site-packages/matplotlib/artist.py", line 59, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/lib/python3.5/site-packages/matplotlib/axis.py", line 1128, in draw
self.label.draw(renderer)
File "/usr/lib/python3.5/site-packages/matplotlib/artist.py", line 59, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/lib/python3.5/site-packages/matplotlib/text.py", line 595, in draw
bbox, info, descent = self._get_layout(renderer)
File "/usr/lib/python3.5/site-packages/matplotlib/text.py", line 320, in _get_layout
ismath=ismath)
File "/usr/lib/python3.5/site-packages/matplotlib/backends/backend_agg.py", line 223, in get_text_width_height_descent
renderer=self)
File "/usr/lib/python3.5/site-packages/matplotlib/texmanager.py", line 670, in get_text_width_height_descent
dvifile = self.make_dvi(tex, fontsize)
File "/usr/lib/python3.5/site-packages/matplotlib/texmanager.py", line 394, in make_dvi
texfile = self.make_tex(tex, fontsize)
File "/usr/lib/python3.5/site-packages/matplotlib/texmanager.py", line 309, in make_tex
fh.write(s.encode('ascii'))
UnicodeEncodeError: 'ascii' codec can't encode character '\u03b1' in position 298: ordinal not in range(128)