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

**Follow-Ups**:**Minimize***From:*Artur <grafix@csl.pl>