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Re: Does ContourPlot behave correctly?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg59843] Re: Does ContourPlot behave correctly?
  • From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 24 Aug 2005 06:30:10 -0400 (EDT)
  • Organization: Uni Leipzig
  • References: <deeo93$38f$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

have you tryed to use x in [-2,2] and
 y in [-2,2] ??
Regards
  Jens

"Vladislav" <kazimir04 at yahoo.co.uk> schrieb im 
Newsbeitrag news:deeo93$38f$1 at smc.vnet.net...
| Hello,
|
| I try two commands, the only difference being .9 
in lieu of .5 in the
| Contours option.
|
| ContourPlot[Exp[-(x^2 +
|    y^2)/2], {x, -1, 1}, {y, -1, 1},
|      Contours -> {.39, .5, .95},
|      ColorFunction -> (
|      GrayLevel[#1] &), PlotPoints -> 100];
|
| ContourPlot[Exp[-(x^2 +
|    y^2)/2], {x, -1, 1}, {y, -1, 1},
|      Contours -> {.39, .9, .95},
|      ColorFunction -> (GrayLevel[#1] &),
|      PlotPoints -> 100];
|
|
| I obtain two different plots. The smallest 
circle is the same for the
| two pictures, it is OK becouse it corresponds to 
the Contor at 0.95.
|
| I expected to have 3 circle on the two pictures 
with the only
| difference in the second circle at .9 or .5. In 
reallity, I have only
| two circles in the first plot and three circles 
in the second one.
| Moreover the external contour at .39 is not the 
same in the two
| pictures.
|
| Can anybody explain or justify this behavoir?
|
| Vlad
| 



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