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MathGroup Archive 2005

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Re: Strange error when using InequalityPlot3D

  • To: mathgroup at smc.vnet.net
  • Subject: [mg60422] Re: Strange error when using InequalityPlot3D
  • From: dh <dh at metrohm.ch>
  • Date: Fri, 16 Sep 2005 03:49:01 -0400 (EDT)
  • References: <dgbeu3$fo7$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,
silly mistakes produce stupid output.
The Equal operator is written: ==, this is only too often confused with =.
= is the Set operator that sets the  left hand variable to the value of 
the right side.
sincerely, Daniel

flatuniverse wrote:
> 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
> 


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