#4462: contour_plot defaults changed to fill, affects implicit_plot
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Reporter: john_perry | Owner: was
Type: defect | Status: new
Priority: minor | Milestone:
Component: graphics | Keywords:
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In Sage 3.1.1,
{{{
implicit_plot(x^2+y^2-1,(x,-1.1,1.1),(y,-1.1,1.1),plot_points=100).show(aspect_ratio=1)
}}}
produces a very nice circle.
In Sage 3.1.4, the same code produces a filled-in disc. Likewise,
implicit_plot tries to fill in all curves;
{{{
implicit_plot(5*x^4-x^2-y^2,(x,-5,5),(y,-5,5))
}}}
looks odd.
The cause is contour_plot (called by implicit_plot): the default for the
fill option is True. Feeding fill=False to implicit_plot produces the
desired behavior:
{{{
implicit_plot(x^2+y^2-1,(x,-1.1,1.1),(y,-1.1,1.1),plot_points=100,fill=False).show(aspect_ratio=1)
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4462>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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