How can I paint a surface according to another scalar function?

Dear experts,

Assume I am given with the surface: z=4-x-y^2 . I now want every point on the surface to be colored according to a function: R(x,y,z).

Is there any simple way to make such a coloring?

Thanks a lot in advance!

Answer 1

[Mike Garrity]

Something like this?

[x,y] = meshgrid(linspace(-2,2,50));
z = 4-x-y.^2;
c = x.^2 - y;
surf(x,y,z,c)

[Johnson]

I think that yes ! Thanks a lot ! But- just to make sure, what exactly does $c$ gives? I mean, does it paint every point according to z=c ?

[Mike Garrity]

No, the 3rd argument (z) gets turned into the Z coordinate, and the 4th argument (c) gets turned into a color value. If you do this:

colorbar

You'll get a colorbar which shows the relationship between the values in c and the colors that are used for each point on the surface.