MathGroup Archive 1999

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Plot3D Problem with Nonreal Numbers

  • To: mathgroup at
  • Subject: [mg20045] Re: Plot3D Problem with Nonreal Numbers
  • From: "Seth Chandler" <Schandler at>
  • Date: Sat, 25 Sep 1999 18:46:08 -0400
  • Organization: University of Houston
  • References: <7shqcb$>
  • Sender: owner-wri-mathgroup at

You might want to try the package ContourPlot3D.


ContourPlot3D[x^2 - y^2 + z^2, {x, -10, 10}, {y, -10, 10}, {z, -10, 10},
  Contours -> {4}]

I'm not a mathematician either.

Seth J. Chandler
Associate Professor of Law
University of Houston Law Center

JAM <jmac at> wrote in message news:7shqcb$1rn at
> 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

  • Prev by Date: Re: Keyboard trouble in Mathematica 3.0
  • Next by Date: Re: Remote shell with X-window emulator
  • Previous by thread: Re: Plot3D Problem with Nonreal Numbers
  • Next by thread: Re: Plot3D Problem with Nonreal Numbers