Re: Contourplot3d of a list of expressions

• To: mathgroup at smc.vnet.net
• Subject: [mg93130] Re: Contourplot3d of a list of expressions
• From: dh <dh at metrohm.ch>
• Date: Tue, 28 Oct 2008 04:52:58 -0500 (EST)
• References: <gdrqak\$mof\$1@smc.vnet.net>

```
Hi Walied,

ContourPlot3D can only Plot one expresion. To get several in one plot,

you first draw them separately and join them using Show. E.g.:

g=ContourPlot3D[#,{x,0,1},{y,0,1},{z,0,1}]&/@{x+y+z,x-y-z}

Show@@g

hope this helps, Daniel

Walied.Othman at gmail.com wrote:

> I am puzzled, I have a Table of 4 expressions in the variables X,Y,t.

> Somewhere in obtaining those expressions I also use transpose. The

> following works, it returns four separate plots

> {ContourPlot3D[Evaluate[{CovBand[[1]]}], {X, -4, 4}, {Y, -4, 6}, {t,

> 1, 2.7}], ContourPlot3D[Evaluate[{CovBand[[2]]}], {X, -4, 4}, {Y, -4,

> 6}, {t, 1, 2.7}], ContourPlot3D[Evaluate[{CovBand[[3]]}], {X, -4, 4},

> {Y, -4, 6}, {t, 1, 2.7}], ContourPlot3D[Evaluate[{CovBand[[4]]}], {X,

> -4, 4}, {Y, -4, 6}, {t, 1, 2.7}]}

>

> However, whenever I try to plot all of them in one single box, using

> {ContourPlot3D[Evaluate[{CovBand[[1]],CovBand[[2]],CovBand[[3]],CovBand[[4]]}],

> {X, -4, 4}, {Y, -4, 6}, {t, 1, 2.7}]}

> I consistently get a "-3.5 is not a variable" or "... can not be

> transposed" errors. Yes, some transposing does happen to obtain the

> expression.

>

> At the basis of this lie 2 equations, both of which are a circle or an

> ellipse. I use the exact same approach for all combinations, and

> circle-circle and ellipse-ellipse does what I want it to do without

> producing errors, but ellipse-circle does not as outlined above. And

> it's only the contourplot3d producing the errors, all the computations

> leading to contourplot3d execute without an error.

>

> Any pointers to what's going wrong?

>

> kind regards,

> Walied Othman

>

--

Daniel Huber

Metrohm Ltd.

Oberdorfstr. 68

CH-9100 Herisau

Tel. +41 71 353 8585, Fax +41 71 353 8907

E-Mail:<mailto:dh at metrohm.com>

Internet:<http://www.metrohm.com>

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