[R] is that possible to graph 4 dimention plot

gcheer3 gcheer3 at gmail.com
Sun Oct 4 21:14:56 CEST 2009

Suppose there are 4 variables
d is a function of a , b and c
I want to know how a, b and c change will make d change
It will be straightforward to see it if we can graph the d surface

if d is only a function of a and b, I can use 'persp' to see the surface of
d. I can easily see at what values of a and b, d will get the maxium or
minium or multiple modes, etc

But for 4 dimention graph, is there a way to show the surface of d
Will use color help

Thanks a lot
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