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MathGroup Archive 1997

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Re: Plot3D error

  • To: mathgroup at smc.vnet.net
  • Subject: [mg7342] Re: [mg7322] Plot3D error
  • From: Richard Finley <trfin at fiona.umsmed.edu>
  • Date: Tue, 27 May 1997 22:27:23 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Karl, 

The problem is that there are 3 different roots of your equation since it is
a cubic root, and some of the roots are imaginary. These obviously cannot be
plotted in real space.  To get Mma to default to the real roots only you can
use:

<<Miscellaneous`RealOnly`

prior to plotting and it will work correctly.

RF


At 02:23 AM 5/23/97 -0400, you wrote:
>Hello everybody.
>
>Can anyone tell me what's wrong?
>
>Clear[x,y,z];
>Plot3D[(1+2 x+y^2)^(1/3),{x,-10,10},{y,-10,10}]
>
>gives me error:  Plot3D::gval: Function value 0.4+0.7I at grid point ...is
>not real
>etc.
>And function is not completely plotted.
>Any suggestion would be appreciated.
>
>Karl Kevala
>
>



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