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MathGroup Archive 2005

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Re: Plotting a super ellipse

  • To: mathgroup at
  • Subject: [mg55121] Re: Plotting a super ellipse
  • From: Peter Pein <petsie at>
  • Date: Sun, 13 Mar 2005 04:57:39 -0500 (EST)
  • References: <d0u71l$kno$>
  • Sender: owner-wri-mathgroup at

JC wrote:

> I am trying to get Mathematica to plot a super ellipse.  The formula
> is (x^2.5/1) + (y^2.5/1.25^2.5) = 20.
> I am getting error messages such as the "not a list of real numbers"
> or "protected symbols"  
> Can some one help me out or point me in the right direction to find
> the help?  
> I should mention I am brand new to Mathematica, I downloaded the trial
> version yesterday.  I have read through the tutorials and tried
> googling for help but I am coming up blank.  
Hi JC,

 use ImplicitPlot to plot implicitely ;-) and Abs[] to avoid imaginary
Parts (e.g. (-1)^(2.5))

ImplicitPlot[Abs[(x^2.5) + (y^2.5/1.25^2.5)] == 20., {x, -4, 4}, {y, -5, 5}]

Peter Pein

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