       Re: How to set y always greater than or equal to x for a function?

• To: mathgroup at smc.vnet.net
• Subject: [mg46583] Re: How to set y always greater than or equal to x for a function?
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Tue, 24 Feb 2004 21:04:33 -0500 (EST)
• Organization: Universitaet Leipzig
• References: <c1ehpp\$kgg\$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```Hi,

Plot3D[] can only handel rectanglular domains but you can
try

Plot3D[If[y > x, Sqrt[y - x], 0], {x, -100, 100}, {y, -100, 100}];

or you have to use TriangularSurfacePlot[]

Regards
Jens

Albert Franco wrote:
>
> I recently purchased Mathematica 5.0, and I am in the process of
> learning how to take advantage of it's many features.
>
> This is an example of one line I would like to calculate in Mathematica:
>
> Plot3D[Sqrt[y-x],{x,-100,100},{y,-100,100}];
>
> How can I best edit this line to make y always greater than or equal to x during
> calculation so the program doesn't try to take the square root of a
> negative number?
>
> Any help will be appreciated.
>
> Albert Franco

```

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