Hi Robert,

On Tue, 16 Feb 2010 06:19:41 -0800 (PST)
"[email protected]" <[email protected]> wrote:

> Dear sage-support
> 
> the following plot works
> 
> x,y=var('x,y')
> contour_plot(sqrt(1-(x^2+y)^2),(x,-2,2),(y,-2,0), fill=False,
> labels=True)
> 
> but the following not:
> 
> x,y=var('x,y')
> contour_plot(ln(1-(x^2+y)^2),(x,-2,2),(y,-2,0), fill=False,
> labels=True)
> 
> I get
> Traceback (click to the left of this block for traceback)
> ...
> ValueError: math domain error
> 
> 
> How can I plot the second picture? Thanks.

You should apply the patch attached to this ticket:

http://trac.sagemath.org/sage_trac/ticket/7822


Cheers,
Burcin

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