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Topic: Re: [mg7322] Plot3D error
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Andrei Constantinescu

Posts: 32
Registered: 12/7/04
Re: [mg7322] Plot3D error
Posted: May 29, 1997 1:23 AM
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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 ...is
> 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 !

Cheers,

Andrei







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