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MathGroup Archive 2005

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Re: ParametricPlot3D

  • To: mathgroup at smc.vnet.net
  • Subject: [mg61712] Re: ParametricPlot3D
  • From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
  • Date: Thu, 27 Oct 2005 05:01:37 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <200510250528.BAA23561@smc.vnet.net> <djn3ri$iol$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

ParametricPlot3D[] has the HoldAll attribute and 
you must use

ParametricPlot3D[Evaluate[ToPlot], {t, 0, 3.1415}, 
{f, 0, 2 3.1415}];

to get it work for a list of surfaces.
Regards
  Jens


"Maurits Haverkort" <Haverkort at ph2.uni-koeln.de> 
schrieb im Newsbeitrag 
news:djn3ri$iol$1 at smc.vnet.net...
| 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
| 



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