Re: ContourPlot problem

*To*: mathgroup at smc.vnet.net*Subject*: [mg90084] Re: ContourPlot problem*From*: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>*Date*: Sat, 28 Jun 2008 05:53:00 -0400 (EDT)*Organization*: The Open University, Milton Keynes, UK*References*: <g42ere$no5$1@smc.vnet.net>

Jorge Cortes wrote: > I've noticed the following problem with ContourPlot (I'm using > Mathematica 6..0.3) and a simple exponential function. > > If you try the domain {x,-3,3}, {y,-3,3} > > ContourPlot[Exp[-x^2 - 2 y^2], {x, -3,3}, {y, -3, 3}, > Contours -> {.1,.2, .3, .4, .5, .6, .7, .8, .9, 1}, > ContourLabels -> True, ContourShading -> False] > > you only get one contour (the one corresponding to .1). However, if > you shrink the domain to {x,-2,2}, {y,-2,2}, surprisingly you get all > the contours (?) <snip> Specifying PlotRange -> {-2, 2} or PlotRange -> {-3, 3} will show everything. For instance, ContourPlot[Exp[-x^2 - 2 y^2], {x, -3, 3}, {y, -3, 3}, Contours -> {.1, .2, .3, .4, .5, .6, .7, .8, .9, 1}, ContourLabels -> True, ContourShading -> False, PlotRange -> {-3, 3}] Regards, -- Jean-Marc