[R] xyplot : superimposed 2 groups in different panels

[PtitBleu]

Hello,

I would like to plot the following xyplot : for each date of fff (1 date per
panel), bbb=f(aaa) for the two groups (ddd=1 and ddd=2) superimposed.

I can do it by group (see below) but not together.
I looked at http://lmdvr.r-forge.r-project.org/figures/figures.html but I
haven't found what I was looking for (to be honest, I haven't understood all
the examples).

Any help will be welcome.
Thanks in advance,
Ptit Bleu.


# aaa : x-axis
# bbb : y-axis
# ddd : group 1 or group 2
# fff : 2 different dates

aaa<-rep(seq(1:100),2)
bbb<-aaa*aaa*c(rep(1,50),rep(0.5,50))
ddd<-c(rep(1,50),rep(2,50))
fff<-rep(c(rep("2010-11-01",25),rep("2010-11-10",25)),2)

library(lattice)
# bbb as a function of aaa by date for the first group (ddd=1)
x11()
xyplot(bbb[ddd==1] ~ aaa[ddd==1] | fff[ddd==1], col="red", main="1")
# bbb as a function of aaa by date for the second group (ddd=2)
x11()
xyplot(bbb[ddd==2] ~ aaa[ddd==2] | fff[ddd==2], col="blue", main="2")

# bbb as a function of aaa by date for ddd=1 AND bbb as a function of aaa by
date for ddd=2 in the same panels
???

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