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Re: Plot3D error

  • To: mathgroup at
  • Subject: [mg7347] Re: [mg7322] Plot3D error
  • From: "Sherman.Reed" <sherman.reed at>
  • Date: Tue, 27 May 1997 22:27:34 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

The answer is in the explanation provided.

the function is not real, it is complex.  I use a Table command to see what
is going on when I run into such comments.

Plot and Plot3D only plot real values.
Sherman C. Reed
sherman.reed at

> From: Darrmis <darrmis at>
To: mathgroup at
> To: mathgroup at
> Subject: [mg7347] [mg7322] Plot3D error
> Date: Friday, May 23, 1997 1:23 AM
> 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
> not real
> etc.
> And function is not completely plotted.
> Any suggestion would be appreciated.
> Karl Kevala

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