Description
Symptoms
Axis tickmarks with values of 1e20 or higher break a rendering process.
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/home/gereon/sideprojects/selectionforagainst/generate_graphs.py", line 138, in <module>
pl.savefig(os.path.join(folder, "xcor{:s}.png".format(run_id)))
File "/usr/local/lib/python3.3/site-packages/matplotlib/pyplot.py", line 472, in savefig
return fig.savefig(*args, **kwargs)
File "/usr/local/lib/python3.3/site-packages/matplotlib/figure.py", line 1364, in savefig
self.canvas.print_figure(*args, **kwargs)
File "/usr/local/lib/python3.3/site-packages/matplotlib/backend_bases.py", line 2093, in print_figure
**kwargs)
File "/usr/local/lib/python3.3/site-packages/matplotlib/backends/backend_agg.py", line 491, in print_png
FigureCanvasAgg.draw(self)
File "/usr/local/lib/python3.3/site-packages/matplotlib/backends/backend_agg.py", line 439, in draw
self.figure.draw(self.renderer)
File "/usr/local/lib/python3.3/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/local/lib/python3.3/site-packages/matplotlib/figure.py", line 1000, in draw
func(*args)
File "/usr/local/lib/python3.3/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/local/lib/python3.3/site-packages/matplotlib/axes.py", line 2088, in draw
a.draw(renderer)
File "/usr/local/lib/python3.3/site-packages/matplotlib/artist.py", line 55, in draw_wrapper
draw(artist, renderer, *args, **kwargs)
File "/usr/local/lib/python3.3/site-packages/matplotlib/axis.py", line 1049, in draw
ticks_to_draw = self._update_ticks(renderer)
File "/usr/local/lib/python3.3/site-packages/matplotlib/axis.py", line 936, in _update_ticks
tick_tups = [t for t in self.iter_ticks()]
File "/usr/local/lib/python3.3/site-packages/matplotlib/axis.py", line 936, in <listcomp>
tick_tups = [t for t in self.iter_ticks()]
File "/usr/local/lib/python3.3/site-packages/matplotlib/axis.py", line 882, in iter_ticks
self.major.formatter.set_locs(majorLocs)
File "/usr/local/lib/python3.3/site-packages/matplotlib/ticker.py", line 483, in set_locs
self._set_format(vmin, vmax)
File "/usr/local/lib/python3.3/site-packages/matplotlib/ticker.py", line 550, in _set_format
if np.abs(locs - np.round(locs, decimals=sigfigs)).max() < thresh:
File "/usr/local/lib/python3.3/site-packages/numpy/core/fromnumeric.py", line 2402, in round_
return round(decimals, out)
AttributeError: 'float' object has no attribute 'rint'
Diagnosis
This happens due to line 539 in the definition of _set_format (in matplotlib/ticker.py):
locs = (np.asarray(_locs) - self.offset) / 10 ** self.orderOfMagnitudeFor self.orderOfMagnitude>=20, 10**self.orderOfMagnitude cannot be cast into numpy.uint64, so the generated array is of dtype object, and this leads to the whole of locs acquiring that dtype. The resulting objects matplotlib tries to round in the later steps are therefore not numpy.float64s, but python floats, which do not have an rint method.
Fix suggestion
locs = (np.asarray(_locs) - self.offset) / 10. ** self.orderOfMagnitudeIf I were more familiar with the intestines of matplotlib, this might just be a pull request, but from my current perspective I cannot decide how much just making the 10 a float, and thereby making the full thing become a numpy.array of numpy.float64s, might break other things.