R help - Nov 2006 - Looking for nice implementations of rectangular scatterplot matrices

... finding myself doing this by hand one too many times ... maybe someone else
has found a nice general solution ...

I have a data frame containing n rows on p+q variables which I will call p.1,
p2, ..., pp and q1, q2, ... qq. For simplicity all of these variables are
continuous numeric. I want to create the following arrangement of plots:

A scatterplot matrix which contains p times q panels layed out as p rows and q
columns.
In each panel indexed by i and j I want the scatterplot of p.i versus q.j
I also want to be able to integrate other typical lattice/grid goodies such as
colors, symbols, groups, fits ...
The icing on the cake would be that the locator would work (that is, that I can
select a point and find out its coordinates (and the leaf of the grob tree) so
that I can annotate it.

... thanks in advance ...

Christian Ritter
Senior Statistical Consultant
Analytical and Statistical Services
Shell Coordination Centre S.A.
Monnet Centre International Laboratory, Avenue Jean Monnet 1, B-1348
Louvain-La-Neuve, Belgium

Tel: +32 10 477  349 Fax: +32 10 477 219
Email: christian.ritter@shell.com
Internet: http://www.analyticalsolutions4u.eu


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library(lattice)

tmp <- data.frame(y1=rnorm(3), y2=rnorm(3),
                  x1=rnorm(3), x2=rnorm(3), x3=rnorm(3))
xyplot(y1+y2 ~ x1+x2+x3, data=tmp, outer=TRUE)