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Re: implcit plot with undefined expression


Dear zoominzero,

You have two other options to obtain an Implicit Plot:

1. ContourPlot

ContourPlot[Re[Sqrt[2*Sqrt[2X^2 - Y^2] - 2*Y + X^2]], {X, -2, 2}, {Y, -2, 2},
  PlotPoints -> 120, Contours -> {0}]

The result is determined numerically and is not very good due to the
infinite slope of Sqrt around 0.


2. symbolic Solve

(Works in this case. Why not use is it?!)

Solve[Sqrt[2*Sqrt[2X^2 - Y^2] - 2*Y + X^2] == 0, Y]

Plot[Evaluate[Y /. %], {X, -2, 2}]



Ciao,  Markus van Almsick


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