hello:
I am trying to use R to draw a 3D picture, then color the picture according to
the value of z , how could I do this job?
this is my exalple
x<-y<-seq(-50,50,2)
m<-function(x,y) x^3+y^3-x^2*y-x*y^2
z<-outer(x,y,m)
persp(x,y,z,theta=-60,phi=30)
I want to draw the Zmax in red and Zmin in blue, the value between Zmax and
Zmin is colored gradually
thank you very much
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