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ParametricPlot3D is buggy
*To*: mathgroup at smc.vnet.net
*Subject*: [mg25223] ParametricPlot3D is buggy
*From*: Will Self <wself at msubillings.edu>
*Date*: Fri, 15 Sep 2000 02:21:55 -0400 (EDT)
*Sender*: owner-wri-mathgroup at wolfram.com
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.
Will Self
Sent via Deja.com http://www.deja.com/
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