> I tried to plot the polar form of the cartesian equation x=2, polar( r =
> sec(x) )
> but the polar_plot() function returns only the vertical axis. Attached is
> a screenshot of the output.
>
sage: polar_plot(sec(x),(x,0,pi))
What are you expecting to appear, exactly? sec(pi/2) blows up to infinity,
and in any case you are just plotting a vertical line.
sage: polar_plot(sec(x),(x,0,pi/2))
/Users/.../sage-6.5/local/lib/python2.7/site-packages/matplotlib-1.3.1-py2.7-macosx-10.7-x86_64.egg/matplotlib/axis.py:1004:
UserWarning: Unable to find pixel distance along axis for interval padding;
assuming no interval padding needed.
warnings.warn("Unable to find pixel distance along axis for interval
padding; assuming no interval padding needed.")
/Users/.../sage-6.5/local/lib/python2.7/site-packages/matplotlib-1.3.1-py2.7-macosx-10.7-x86_64.egg/matplotlib/axis.py:1011:
UserWarning: Unable to find pixel distance along axis for interval padding;
assuming no interval padding needed.
warnings.warn("Unable to find pixel distance along axis for interval
padding; assuming no interval padding needed.")
I find this plot at least somewhat helpful:
sage: polar_plot(sec(x),(x,-pi/8,pi/8),ticks=[[],None],aspect_ratio='auto')
To sage devs: See http://trac.sagemath.org/ticket/19087 for something this
uncovered with our new plot "rich repr" stuff.
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