hello,
what i'm trying to achieve is shown in the comment (# ...) below, which is
surely very wrong, but probably intuitively more meaningful that i can
provide in words.
xyplot(y~x2|x1+which,data=make.groups(
"a"=data.a,
"b"=data.b,
"c"=data.c
),
panel=function(...){
panel.abline(a=0,b=0)
panel.points(...)
# if(x1==0 & which=="a") panel.abline(...)
},
layout=c(2,3),
pch=20,
ylim=c(-10,10),
xlab="x2",
cex=0.5
)
thank!
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