[R] is that possible to graph 4 dimention plot

[Duncan Murdoch]

On 04/10/2009 3:14 PM, gcheer3 wrote:
> 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

contour3d in the misc3d package can do something like that.

Duncan Murdoch