Re: ParametricPlot3D

*To*: mathgroup at smc.vnet.net*Subject*: [mg61726] Re: [mg61693] ParametricPlot3D*From*: Bob Hanlon <hanlonr at cox.net>*Date*: Thu, 27 Oct 2005 05:02:00 -0400 (EDT)*Reply-to*: hanlonr at cox.net*Sender*: owner-wri-mathgroup at wolfram.com

Use Evaluate ToPlot = {{Cos[f] Sin[t], Sin[t] Sin[f], Cos[t]}, {Cos[f] Sin[t] + 1, Sin[t] Sin[f], Cos[t]}}; ParametricPlot3D[Evaluate[ToPlot], {t, 0, Pi}, {f, 0, 2 Pi}]; Bob Hanlon > > From: "Maurits Haverkort" <Haverkort at ph2.uni-koeln.de> To: mathgroup at smc.vnet.net > Date: 2005/10/26 Wed AM 01:01:48 EDT > Subject: [mg61726] [mg61693] ParametricPlot3D > > Dear all > > I want to plot several surfaces in one plot and used for that > ParametricPlot3D. Everything works fine if I enter the definitions for the > functions inline. If I define however a variable (list) that holds the > different functions it does not work anymore. Does anybody know a way out? > > The functions I want to plot are for example two spherse of unit radia > centered at 000 and 100. (I need in the end to plot funcitons (R[t,f] > centered at different orrigens) > > If I write it inline it works fine > ParametricPlot3D[{{Cos[f] Sin[t], Sin[t] Sin[f], Cos[t]}, {Cos[f] Sin[t] + > 1, Sin[t] Sin[f], Cos[t]}}, {t, 0, 3.1415}, {f, 0, 2 3.1415}]; > > If however I first define my functions and then try to plot: > ToPlot = {{Cos[f] Sin[t], Sin[t] Sin[f], Cos[t]}, {Cos[f] Sin[t] + 1, Sin[t] > Sin[f], Cos[t]}}; > ParametricPlot3D[ToPlot, {t, 0, 3.1415}, {f, 0, 2 3.1415}]; > I get the error: > ParametricPlot3D::ppfun : Argument ToPlot is not a list with three or four > elements. More. > > Since the function I need to plot is a result of a calculation I rather need > to input it as a variable. Any sugestions? > > Thanks, > Maurits > >