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MathGroup Archive 2006

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ContourPlot and finite approximation to level sets

  • To: mathgroup at smc.vnet.net
  • Subject: [mg68629] ContourPlot and finite approximation to level sets
  • From: dkjk at bigpond.net.au
  • Date: Sun, 13 Aug 2006 05:52:48 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hi all,

Given a real-valued function f(x,y) over {(x,y) | xmin < x < xmax, ymin
< y < ymax}, ContourPlot can be used to generate the graph of the level
set { (x,y) | f(x,y) = c } using

ContourPlot[f[x,y],{x,xmin,xmax},{y,ymin,ymax},Contours->{c},ContourShading->False].

Is there any way to access the coordinates used by Mathematica to paint
the contour line of height c? If not, can anyone suggest an algorithm,
such as the one used by Mathematica, to finitely approximate a level
set?

Thanks very much in advance,

James


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