I'm using sage-4.8 and those commands work just fine!

Cheers.

On Jan 31, 2:19 pm, "D.C. Ernst" <ernst.tr...@gmail.com> wrote:
> If I plot
>
> var('x y z')
> A=implicit_plot3d(x+y+z==1,(x,-3,3),(y,-3,3),(z,-3,3))
> B=implicit_plot3d(x+y+z==0,(x,-3,3),(y,-3,3),(z,-3,3),color='red')
> A+B
>
> You get what you expect.  However, if I plot
>
> var('x y z')
> A=implicit_plot3d(x+y+z==1,(x,-3,3),(y,-3,3),(z,-3,3))
> B=implicit_plot3d(x+y+z==0,(x,-3,3),(y,-3,3),(z,-3,3),color='red')
> C=plot3d(x^2+y^2,(x,-3,3),(y,-3,3),color='green')
> A+B+C
>
> the plots for the two planes A and B are cropped.  What's going on here?
>  (Hopefully, I'm not being silly.)
>
> Dana

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