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/ Before you buy.