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MathGroup Archive 1997

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Re: Plot3D error

  • To: mathgroup at
  • Subject: [mg7331] Re: [mg7322] Plot3D error
  • From: Andrei Constantinescu <constant at>
  • Date: Tue, 27 May 1997 22:26:58 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

On Fri, 23 May 1997, Darrmis 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
> not real
> etc.
> And function is not completely plotted.
> Any suggestion would be appreciated.
> Karl Kevala
 There is really a problem to plot as your function ^(1/3) has actually 3 
 solutions, one real and  two complex. You have to choose the real one 
 in order to plot it !



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