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MathGroup Archive 2005

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Re: Plotting a super ellipse

  • To: mathgroup at smc.vnet.net
  • Subject: [mg55142] Re: Plotting a super ellipse
  • From: JC <Eat at joes.com>
  • Date: Mon, 14 Mar 2005 03:43:41 -0500 (EST)
  • References: <d0u71l$kno$1@smc.vnet.net> <d1145m$dp2$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

On Sun, 13 Mar 2005 10:20:38 +0000 (UTC), Peter Pein <petsie at arcor.de>
wrote:

>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,

Thank you very much for taking the time to reply.

Your suggestion, while not generating an error message, also did not
plot.  This is what it returned:
 
ImplicitPlot[
    Abs[x\^2.5` + 0.5724334022399462`\ y\^2.5`] == 20.`, {x, \(-4\), 
      4}, {y, \(-5\), 5}]\)



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