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Strange error when using InequalityPlot3D

• To: mathgroup at smc.vnet.net
• Subject: [mg60401] Strange error when using InequalityPlot3D
• From: "flatuniverse" <flatuniverse at gmail.com>
• Date: Thu, 15 Sep 2005 05:16:21 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hi All.  I'm trying to visualize chi-squared contours for a 3 parameter
fit.  I can take 2D slices of the contours using ContourPlot, but I'd
like to see the function in 3D.  So I have a function chi2[], and to
see the chi^2=180 contour, I use the following:

InequalityPlot3D[chi2[z1,q0,q1,.6433]=
180,{z1,.1,.6},{q0,-3,1},{q1,-1,3}];

which produces the error,

InequalityPlot3D::region: The region defined by <<1>> could not be
broken down into cylinders.

What's going on here?  Is there a better way to see this function in
3D?

Thanks

• Follow-Ups:
  • Re: Strange error when using InequalityPlot3D
    • From: Andrzej Kozlowski <andrzej@yhc.att.ne.jp>