Re: Plot3D: plot does not display when PlotPoints different from 25. Mathematica 5.2

*To*: mathgroup at smc.vnet.net*Subject*: [mg65811] Re: [mg65730] Plot3D: plot does not display when PlotPoints different from 25. Mathematica 5.2*From*: "David Park" <djmp at earthlink.net>*Date*: Mon, 17 Apr 2006 02:29:07 -0400 (EDT)*Sender*: owner-wri-mathgroup at wolfram.com

Nasser, Simple, with 26 plot points Mathematica never samples x == 0 pr y == 0. David Park djmp at earthlink.net http://home.earthlink.net/~djmp/ From: nma at 12000.org [mailto:nma at 12000.org] To: mathgroup at smc.vnet.net [This post has been delayed due to email problems - moderator] Remove["Global`*"] u[x_, y_] := Module[{}, If[x == 0, Return[1 + y]]; If[y == 0, Return[1]]; Return[0]; ] Plot3D[u[x, y], {x, -1, 2}, {y, -1, 2}, FaceGrids -> None, AxesLabel -> {"U(x,y)", "x", "y"}, PlotLabel -> "Boundary conditions", PlotPoints -> 25] works OK. But if you change 25 to say 26 in the last line above, the plot does not show up any more ! Can someone explain why this is? thanks, Nasser Abbasi