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implcit plot with undefined expression

• To: mathgroup at smc.vnet.net
• Subject: [mg18804] [mg18780] implcit plot with undefined expression
• From: zoominzero at hotmail.com
• Date: Thu, 22 Jul 1999 08:19:24 -0400
• Sender: owner-wri-mathgroup at wolfram.com

Hi,
I've spent 4 days to try to use ImplicitPlot on an equation, without
success:
The Equation I try to plot has 2 nested square roots, ans 2 variables :
something like Sqrt[2*Sqrt[2X^2 -Y^2] - 2*Y +X^2]==0
(it's not exactly this one: it's  just to give you an idea )

Of course this equation is not defined everywhere, and the domain where
it's defined is complex. When i try to "ImplicitPlot" this equation,
i've an answer :
"The contour is attempting to traverse a cell in which some of the
points have not evaluated to numbers, and it will be dropped"
followed by
"Further output of ContourGraphics::"ctpnt" will be suppressed during
this calculation."

So i don't have any answers ( and there are answers of course :)

Is there some options or another solution to draw this implicit equation
?

Thanks by advance


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