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ContourPlot confusion

  • To: mathgroup at
  • Subject: [mg116320] ContourPlot confusion
  • From: kelly <kereidy at>
  • Date: Fri, 11 Feb 2011 04:13:23 -0500 (EST)

Hi!  I'm plotting the following:

ContourPlot[Expression[50, x, y] == 0), {x, -15, -17}, {y, -0.7, -0.5}]

So some previously defined expression which is a function of 50, x, and y.  I've set it to only show the "Expression = 0" contour, which it does.  

However, when I use "Get Coordinates" to get the coordinates of a point along this contour line & plug those coordinates back into the expression, it evaluates to around -33.  Shouldn't it evaluate to 0 if the point lies along the 0 contour?

Any help is appreciated!  So confused!

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