Re: implcit plot with undefined expression

*To*: mathgroup at smc.vnet.net*Subject*: [mg18817] Re: [mg18780] implcit plot with undefined expression*From*: "Richard Finley" <rfinley at medicine.umsmed.edu>*Date*: Thu, 22 Jul 1999 08:19:32 -0400*Sender*: owner-wri-mathgroup at wolfram.com

I didn't have any problem using ImplicitPlot on this equation...note that you can get rid of the outer square root since if it is zero the argument must be zero also. In[1]:= eq = 2*Sqrt[2*x^2 - y^2] - 2*y + x^2 == 0 ; In[2]:= <<Graphics`ImplicitPlot` In[3]:= ImplicitPlot[eq, {x,-Sqrt[2]*2, Sqrt[2]*2}] and the result is a curve symmetrical about the origin as you would expect since the equation only involves terms in x^2. Since you didn't give us the "real" equation you are interested in, it is hard to know if there is some other problem affecting your output. Regards, RF >>> <mathgroup at smc.vnet.net> 07/19/99 11:33PM >>> 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 Sent via Deja.com http://www.deja.com/ Share what you know. Learn what you don't.