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MathGroup Archive 2005

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Re: Re: Plotting a super ellipse

  • To: mathgroup at smc.vnet.net
  • Subject: [mg55157] Re: [mg55143] Re: Plotting a super ellipse
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Tue, 15 Mar 2005 00:21:39 -0500 (EST)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

eqn=(x^(5/2)/1)+(y^(5/2)/(5/4)^(5/2))==20;

soln=y/.Solve[eqn,y][[1]];

xmax=x/.Solve[soln==0,x][[1]];

Plot[Evaluate[{soln,-soln}/.x->Abs[x]],
    {x,-xmax,xmax}];


Bob Hanlon

> 
> From: JC <Eat at joes.com>
To: mathgroup at smc.vnet.net
> Date: 2005/03/14 Mon AM 03:43:42 EST
> Subject: [mg55157] [mg55143] Re: Plotting a super ellipse
> 
> On Sun, 13 Mar 2005 10:22:09 +0000 (UTC), Bob Hanlon 
<hanlonr at cox.net>
> wrote:
> 
> >Clear[x,y];
> >
> >eqn=(x^(5/2)/1)+(y^(5/2)/(5/4)^(5/2))==20;
> >
> >soln=y/.Solve[eqn,y][[1]]
> >
> >(5/4)*(20 - x^(5/2))^(2/5)
> >
> >ymax = (soln /. x->0)
> >
> >(5*5^(2/5))/(2*2^(1/5))
> >
> >%//N
> >
> >4.14307
> >
> >xmax=(x/.Solve[soln==0,x][[1]])
> >
> >2^(4/5)*5^(2/5)
> >
> >%//N
> >
> >3.31445
> >
> >Plot[soln,{x,0,xmax},
> >    AspectRatio->Automatic];
> >
> >Needs["Graphics`"];
> >
> >ImplicitPlot[eqn,{x,0,xmax},
> >    ImageSize->230];
> >
> >
> >Bob Hanlon
> >
> 
> Bob,
> 
> Thank you very much for your response. It worked.  Now I will just
> need to decipher it so I can change the  variables to adjust the
> curve, but that is not a big problem.
> 
> One question.  The plot produced only was for one quarter of the super
> ellipse. Is there a way to get the entire ellipse to plot? 
> 
> >> 
> >> From: JC <Eat at joes.com>
To: mathgroup at smc.vnet.net
> >> Date: 2005/03/12 Sat AM 02:36:47 EST
> >> Subject: [mg55157] [mg55143]  Plotting a super ellipse
> >> 
> >> 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.  
> >> 
> >> 
> 
> 


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