f[x_, y_] := 9 /; 0 < x [And] 0 < y [And] x^2 + y^2 <= 1
Plot3D[f[x, y], {x, -5, 5}, {y, -5, 5}, AxesLabel -> Automatic,
Filling -> Bottom]
How can I create the surface f(x,y)=9,-5<x<5 and -5<y<5 on the x>0,y>0 and x^2 + y^2 <= 1 region ?
One way is to use RegionFunction->Function[{x, y, z}, And[0 < x, 0 < y, x^2 + y^2 <= 1]].
How is it going to be.
Look up the documentation for RegionFunction and you will see examples.
Plot3D[9, {x, -5, 5}, {y, -5, 5},
RegionFunction →
Function[{x, y, z}, x^2 + y^2 <= 1 [And] x > 0 [And] y > 0],
Filling → Bottom, AxesLabel → Automatic]
I write like this but it doesn’t create a visual from this code
Plot3D requires x,y,z values. Change 9 to {0,0,9}.