fplot3d - 3D plot of a surface defined by a function
fplot3d plots a surface defined by the external function f on the grid defined by xr and yr .
Enter the command fplot3d() to see a demo.
deff('z=f(x,y)','z=x^4-y^4')
x=-3:0.2:3 ;y=x ;
clf() ;fplot3d(x,y,f,alpha=5,theta=31)
plot3d ,
J.Ph.C.