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Description
Saving a figure with plt.savefig in svg file format using the cairo backend results in a TypeError. The Traceback is:
File "/sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/util/plot.py", line 814, in save_and_close_fig
plt.savefig('plot.svg', transparent=True, dpi=800)
File "/sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/pyplot.py", line 689, in savefig
res = fig.savefig(*args, **kwargs)
File "/sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/figure.py", line 2094, in savefig
self.canvas.print_figure(fname, **kwargs)
File "/sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/backend_bases.py", line 2075, in print_figure
**kwargs)
File "/sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/backends/backend_cairo.py", line 569, in print_svg
return self._save(fobj, 'svg', *args, **kwargs)
File "/sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/backends/backend_cairo.py", line 622, in _save
self.figure.draw(renderer)
File "/sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/artist.py", line 50, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/figure.py", line 1649, in draw
renderer, self, artists, self.suppressComposite)
File "/sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/image.py", line 138, in _draw_list_compositing_images
a.draw(renderer)
File "/sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/artist.py", line 50, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/axes/_base.py", line 2628, in draw
mimage._draw_list_compositing_images(renderer, self, artists)
File "/sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/image.py", line 138, in _draw_list_compositing_images
a.draw(renderer)
File "/sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/artist.py", line 50, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "/sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/axis.py", line 1185, in draw
ticks_to_draw = self._update_ticks(renderer)
File "/sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/axis.py", line 1023, in _update_ticks
tick_tups = list(self.iter_ticks()) # iter_ticks calls the locator
File "/sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/axis.py", line 967, in iter_ticks
majorLocs = self.major.locator()
File "/sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/ticker.py", line 2128, in __call__
return self.tick_values(vmin, vmax)
File "/sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/ticker.py", line 2189, in tick_values
have_subs = len(subs) > 1 or (len(subs == 1) and subs[0] != 1.0)
TypeError: len() of unsized object
Uncaught exception. Entering post mortem debugging
Running 'cont' or 'step' will restart the program
> /sfs/fs5/home-sh/sunip229/opt/miniconda3/envs/py37_forge_jore/lib/python3.7/site-packages/matplotlib/ticker.py(2189)tick_values()
-> have_subs = len(subs) > 1 or (len(subs == 1) and subs[0] != 1.0)
(Pdb) subs
array(100.)
(Pdb) subs.ndim
0
Maybe subs should be converted to a one dimensional array first.
The versions of the related programs are:
matplotlib 3.0.2 py37h8a2030e_1 conda-forge
matplotlib-base 3.0.2 py37h20b835b_1 conda-forge
cairo 1.14.12 h276e583_5 conda-forge
pycairo 1.18.0 py37h4d1f301_0 conda-forge
python 3.7.1 h5001a0f_0 conda-forge
The bug occurred at several plots. However, the creation of the plots is rather complex. Thus I have no minimal example that reproduces the bug for now. If this is necessary, however, I can try to construct one.
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