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MathGroup Archive 2000

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ContourPlot doesn't work properly?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg23829] ContourPlot doesn't work properly?
  • From: "Higinio Ramos Calle" <higra at gugu.usal.es>
  • Date: Sat, 10 Jun 2000 03:00:51 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Let's take a common function like y=Exp[x]
If I try to make a picture of this function in an implicit way with 
ContourPlot in the form
ContourPlot[Log[y]-x,{x,-10,10},{y,-10,10}, 
PlotPoints->30,Contours->{0},ContourShading->False]

with the option PlotPoints->30 in order to have a more precise picture I 
obtain an error message:

    ContourGraphics::ctpnt:

    The contour is attempting to traverse a cell in which some of the

    points have not evaluated to numbers, and it will be dropped.

and no picture.

But if I let the option PlotPoints his default value the message is the 
same, but now the picture is drawn.

Could anyone explain what happens?

higra at gugu.usal.es


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