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Re: Model the surface of an ellipsoid

  • To: mathgroup at smc.vnet.net
  • Subject: [mg93549] Re: Model the surface of an ellipsoid
  • From: Mayneord <xrayspectrum at googlemail.com>
  • Date: Thu, 13 Nov 2008 21:09:55 -0500 (EST)
  • References: <gfgqib$dm1$1@smc.vnet.net> <gfh3ca$g1d$1@smc.vnet.net>

On Nov 13, 12:34 pm, Jens-Peer Kuska <ku... at informatik.uni-leipzig.de>
wrote:
> Hi,
>
> and
>
> http://mathworld.wolfram.com/Ellipsoid.html
>
> has no parametric or implicit equation for you ?
> And you can't even download the notebookhttp://mathworld.wolfram.com/note=
books/Surfaces/Ellipsoid.nb
>
> ??
> Too bad
>
> Regards
>    Jens

Hi Jens,

Thank you so much for your reply.
when i wrote this post, I was sure that i will get a reply from you
first ;-)

I already download the notebook long ago.
I did not understand anything from that it seems to be too much of
mathematics to me.
In my case i have only 4 unknown parameters ( 1 = Sqrt[r^2/R^2 + d^2/
D^2] ). Typically, also shown in the websitehttp://mathworld.wolfram.com/El=
lipsoid.html,
for a ellipsoidal there must at least three coordinates. But the
equation which is i have seems to be different. please tell me if am
wrong. Please understand i am using mathematica 5.2.

I used an ImplicitPlot like this i get only 2D plot.
ImplicitPlot[Sqrt[(x^2/9) + (y^2/4)] == 1, {x, -3, 3}]

My question is for 3D it is more complicated?  do i need to use much
of trigonometry for the angles?

thanks again

May



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