Re: Plot3D Problem with Nonreal Numbers

• To: mathgroup at smc.vnet.net
• Subject: [mg20042] Re: Plot3D Problem with Nonreal Numbers
• From: "Allan Hayes" <hay at haystack.demon.co.uk>
• Date: Sat, 25 Sep 1999 18:46:07 -0400
• References: <7shqcb\$1rn@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```JAM <jmac at tiac.net> wrote in message news:7shqcb\$1rn at smc.vnet.net...
> Greetings All!
> I'm hoping you can help this struggling artist generate this 3D plot
> destined for a calculus textbook. If the author had provided me with a
> notebook file I wouldn't have to be bothering you, but he didn't. All I
> have is a sketch of something that resembles two funnels joined at the
> narrow end and this equation:
>
> x^2 - y^2 + z^2 = 4
>
> I have solved for z and used the results in Plot3D but this generates an
> error for the points that are not real numbers and only a portion of the
> plot is drawn.
> The question is, is there a way to make Mathematica ignore the solutions
> that are not real? Or is there some other technique I should be using to
> render this graphic.
> Be gentle. Remember I'm an artist, not a mathematician.
> Thanks in advance for any and all assistance.
> --Jim
>

Jim,

You might find the package << Graphics`ContourPlot3D` useful.

Allan
---------------------
Allan Hayes
Mathematica Training and Consulting
Leicester UK
www.haystack.demon.co.uk
hay at haystack.demon.co.uk
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565

```

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