[R] 3D surface plot

[David Winsemius]

On Aug 16, 2011, at 9:50 PM, Eric Heupel wrote:

> I have what is probably a noob question, but....
>
> I am trying to create a 3d plot to illustrate the range of values  
> for the following simple function:
>
> A = B*(C/D)
>
> B, C, and D are independent variables whose range are equal (e.g. 1  
> to 3 inclusive)
>
> I figure it's not possible to map the surface of A on the 3d space  
> defined by B, C and D but I would like to create a surface defined  
> by the lower and upper limits of the variables - that is to say a  
> rectangle with corners at (1,1,1), (2,3,2), (3,3,3) and (3,2,2) with  
> a color map displayed on it corresponding to the values of A and a  
> color key to the side of that.
>
> I have been able to wrap my head part way around persp and wireframe  
> and can create a surface for A~B*(C/D) in either, but have not  
> managed to create either the

The rgl package will allow plotting in pseudo 3D space ... once you  
unwrap your head sufficiently to provide a suitable sample dataset.  
Persp and wireframe are designed for a function of two variables:  A ~  
B*C. You could also plot slices at various levels of D with those or  
perhaps more clearly with levelplot

-- 

David Winsemius, MD
West Hartford, CT