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MathGroup Archive 1995

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Re: Implicit surface plotting

  • To: mathgroup at christensen.cybernetics.net
  • Subject: [mg1536] Re: Implicit surface plotting
  • From: chen at fractal.eng.yale.edu (Richard Q. Chen)
  • Date: Sat, 24 Jun 1995 01:47:22 -0400
  • Organization: Yale University

In article <3s86k6$och at news0.cybernetics.net>, bengtmn at algonet.se (Bengt Mansson) writes:
>How can I use Mathematica to plot surfaces implicitly given, eg an 
>ellipsoid x^2+2y^2+3z^2=1.
>
>Regards, Bengt M.
>
>
>


The most efficient way is to parametrize your surface:

In[1]:= x = Sin[t]Cos[p]

Out[1]= Cos[p] Sin[t]

In[2]:= y = Sin[t]Sin[p]/Sqrt[2]

        Sin[p] Sin[t]
Out[2]= -------------
           Sqrt[2]

In[3]:= z = Cos[t]/Sqrt[3]

        Cos[t]
Out[3]= -------
        Sqrt[3]

In[4]:= ParametricPlot3D[{x,y,z},{t,0,Pi},{p,0,2Pi}]

Out[4]= -Graphics3D-



There are other ways available (using 3D contour plot package,
for example), but they are very time consuming and should be
used only as last resort.

Regards

-- 
Richard Q. Chen
chen at fractal.eng.yale.edu




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