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MathGroup Archive 2000

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Re: ParametricPlot3D is buggy

  • To: mathgroup at smc.vnet.net
  • Subject: [mg25268] Re: [mg25223] ParametricPlot3D is buggy
  • From: BobHanlon at aol.com
  • Date: Sun, 17 Sep 2000 17:33:36 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

In a message dated 9/15/2000 2:55:06 AM, wself at msubillings.edu writes:

>Can anyone explain this bug that appears in ParametricPlot3D
>in my version of Mathematica 4.0.2 on Windows 2000?
>
>-----------------------------------------------------------
>
>This works fine:
>
>ParametricPlot3D[{Cos[t]Cos[u], Sin[t]Cos[u], Sin[u]},
>{t, 0, 2Pi}, {u, -Pi/2, Pi/2}, PlotPoints -> {8, 3}]
>
>But this doesn't give a picture:
>
>ParametricPlot3D[{Cos[t]Cos[u], Sin[t]Cos[u], Sin[u]},
>{t, 0, 2Pi}, {u, -Pi/2, Pi/2}, PlotPoints -> {7, 3}]
>
>This works fine:
>
>ParametricPlot3D[{Cos[t]Cos[u], Sin[t]Cos[u], Sin[u]},
>{t, 0, 2Pi}, {u, -Pi/2, Pi/2}, PlotPoints -> {6, 3}]
>
>But this doesn't give a picture:
>
>ParametricPlot3D[{Cos[t]Cos[u], Sin[t]Cos[u], Sin[u]},
>{t, 0, 2Pi}, {u, -Pi/2, Pi/2}, PlotPoints -> {5, 3}]
>
>In this last case, not only do I not get a picture, if I go
>back and change the PlotPoints option to anything at all,
>in the same cell, I still get no picture.
>
>With PlotPoints set to {4, 3} I again get no picture, but
>surprisingly, with PlotPoings set to {3,3} I get a picture.
>Of course in this case the "sphere" has gone flat.
>
>Do other people experience this same phenomenon? I find it
>amazing and frustrating that ordinary things that have been part
>of Mathematica for a long time do not work correctly.
>

I get the same behavior on a Macintosh running version 4.0.0.0


Bob Hanlon


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