Hi,
Does anyone knows why the default option for “contours” is
set to “(0,0)” in implicit_plot (sage/plot/contour_plot.py line 571-572)?
Instead of being left alone to “None”.
The value “(0,0)” causes a lot of doctest failures when moving from
matplotlib 1.5 to 1.5.1 (not yet a ticket for that, spotted in sage-on-gentoo):
File "/usr/lib64/python2.7/site-packages/sage/plot/graphics.py", line 2563, in
sage.plot.graphics.Graphics.?
Failed example:
gm = g.matplotlib() # long time # without the patch, this goes BOOM -- er,
TypeError
Exception raised:
Traceback (most recent call last):
File "/usr/lib64/python2.7/site-packages/sage/doctest/forker.py", line
499, in _run
self.compile_and_execute(example, compiler, test.globs)
File "/usr/lib64/python2.7/site-packages/sage/doctest/forker.py", line
861, in compile_and_execute
exec(compiled, globs)
File "<doctest sage.plot.graphics.Graphics.?[19]>", line 1, in <module>
gm = g.matplotlib() # long time # without the patch, this goes BOOM --
er, TypeError
File "/usr/lib64/python2.7/site-packages/sage/plot/graphics.py", line
2635, in matplotlib
g._render_on_subplot(subplot)
File "/usr/lib64/python2.7/site-packages/sage/plot/contour_plot.py", line
195, in _render_on_subplot
linewidths=linewidths, linestyles=linestyles,
label=options['legend_label'])
File "/usr/lib64/python2.7/site-packages/matplotlib/__init__.py", line
1812, in inner
return func(ax, *args, **kwargs)
File "/usr/lib64/python2.7/site-packages/matplotlib/axes/_axes.py", line
5644, in contour
return mcontour.QuadContourSet(self, *args, **kwargs)
File "/usr/lib64/python2.7/site-packages/matplotlib/contour.py", line
1424, in __init__
ContourSet.__init__(self, ax, *args, **kwargs)
File "/usr/lib64/python2.7/site-packages/matplotlib/contour.py", line
863, in __init__
self._process_args(*args, **kwargs)
File "/usr/lib64/python2.7/site-packages/matplotlib/contour.py", line
1445, in _process_args
x, y, z = self._contour_args(args, kwargs)
File "/usr/lib64/python2.7/site-packages/matplotlib/contour.py", line
1540, in _contour_args
self._contour_level_args(z, args)
File "/usr/lib64/python2.7/site-packages/matplotlib/contour.py", line
1189, in _contour_level_args
raise ValueError("Contour levels must be increasing")
ValueError: Contour levels must be increasing
Any time “implicit_plot” is called we get a failure because of this.
François
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