R help - Dec 2008 - Identifying a subset of observations on a 3d-scatter plot using cloud()

Hello everyone,
 
This is my first post to the mailing list, so I hope I am posting my message the
correct way.
 
I am trying to present my dataset in a 3d scatterplot using cloud() in the
{lattice} package. I hope to explicitly identify a subset of my observations.
The observations in this subset need to satisfy the following critera (values on
x,y, and z axes above a certain cutoff value). It will be great if I can get
advice on how to annotate the points representing the subset of observations
with a different colour, and if possible, label the points.
 
Thank you in advance for everyone's help!
 
Best regards,
Xingli Giam
Department of Biological Sciences,
National University of Singapore

On Sat, Dec 6, 2008 at 9:27 PM, Giam Xingli <giam at nus.edu.sg>
wrote:
> Hello everyone,
>
> This is my first post to the mailing list, so I hope I am posting my
message the correct way.
>
> I am trying to present my dataset in a 3d scatterplot using cloud() in the
{lattice} package. I hope to explicitly identify a subset of my observations.
The observations in this subset need to satisfy the following critera (values on
x,y, and z axes above a certain cutoff value). It will be great if I can get
advice on how to annotate the points representing the subset of observations
with a different colour, and if possible, label the points.
>
For colors, you could try

cloud(z ~ x * y, ..., groups = (x > c1 & y > c2 & z > c3))

For interactive labeling, see ?panel.identify.cloud. Direct labeling
is also possible, but you need to write a panel function
('panel.3dtext' in the latticeExtra pacakge may help).

-Deepayan