I found the solution. implicit_plot calls contour_plot, whose default
value for the fill option is True. Setting fill=False works:
sage: implicit_plot(x^2+y^2-1,(x,-5,5),(y,-5,5),fill=False)
IMHO most people don't want implicit_plot to fill in by default, so
Trac #4462 has been added.
regards
john perry
On Nov 6, 5:05 pm, john_perry_usm <[EMAIL PROTECTED]> wrote:
> Hullo,
>
> The most recent version I have of Sage (3.1.4) believes that I want my
> implicit plots filled. For example,
> implicit_plot(x^2+y^2-1,(x,-5,5),(y,-5,5))
> gives a filled-in disc, not an open circle.
>
> This happens with open curves, too; check out
> implicit_plot(5*x^4-x^2-y^2,(x,-5,5),(y,-5,5))
>
> This appears to be a change from 3.1.1 and earlier, where implicit
> plots (closed or open) were not filled in.
>
> I verified both at my installation and at sagenb.org. How do I get the
> old functionality back?
>
> regards
> john perry
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