Re: [Maxima-discuss] How to do this in plot3d?

[Jaime V. <vi...@fe...>]

On 21/06/19 17:04, Peter van Summeren wrote:
> Hello,
> I have a function z=f(x,y) and I would like to plot3d it in the 
> x,y=0,z plane, in the x=a,y,z plane and in the x=a,y=b,z plane.
> Maxima refuses something like plot3d(f(x,y),[x,p,q],[y,0,0],[z,r,s]) 
> for the y. Only a range of y is accepted.

Perhaps I didn't understand your question, but it seems to me that what 
you're trying to do are 2D plots and not 3D:

plot2d(subst(y=0,f(x,y)), [x,p,q], [y,r,s], [ylabel,"z"]);

plot2d(subst(x=a,f(x,y)), [y,p,q], [y,r,s], [ylabel,"z"]);

The syntax in the last command is a bit unfortunate. The first y option 
is taken as the interval for the horizontal axis, and the second one as 
the interval for the vertical axis.

Regards,

Jaime