MathGroup Archive 1999

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ContourPlot problem

  • To: mathgroup at
  • Subject: [mg15445] ContourPlot problem
  • From: Pedro A Santos <pasantos at>
  • Date: Mon, 18 Jan 1999 04:21:47 -0500
  • Organization: I.S.T. - Portugal
  • Sender: owner-wri-mathgroup at


When I give the command

  PlotPoints ->{50,50},
  Contours -> {.1,.2,.3,.4,.5,.6,.7,.8,.9,.99, .99999999},
  ContourShading ->False]

I get what would be to expect, i.e. all the contours. But if I change
slightly the domain,
say  "{x,-1.1,1.1},{y,-1.1,1.1}", the majority of the contours
disappear. And they do not appear even if I increase PlotPoints to 200
or more.

Does anybody know the reason of this strange behaviour? And how to avoid

Thanks in advance,

Pedro Santos

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