Re: Strange error when using InequalityPlot3D

• To: mathgroup at smc.vnet.net
• Subject: [mg60429] Re: [mg60401] Strange error when using InequalityPlot3D
• From: Andrzej Kozlowski <andrzej at yhc.att.ne.jp>
• Date: Fri, 16 Sep 2005 03:49:14 -0400 (EDT)
• References: <200509150916.FAA15850@smc.vnet.net>
• Reply-to: Andrzej Kozlowski <andrzej at akikoz.net>
• Sender: owner-wri-mathgroup at wolfram.com

```InequalityPlot and InequalityPlot3D (which are functions defined in
the package <<Graphics`InequalityGraphics` and not a Mathematica
built-in functions) work only with polynomial and rational functions
since they depend on CylindricalDecomposition which only works for
polynomial inequalities.

You could try using ContourPlot3D from the  <<Graphics`ContourPlot3D`
package.

Andrzej Kozlowski

On 15 Sep 2005, at 18:16, 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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