Hi,

I've been driving myself insane with this problem. I have a trellis plot of
contours, and I want each level to have something like "z=value" for each
one. I can get each one to say z, or each one to say the value (by using
as.factor) but not both. Heres an artificial example to show what I mean (as
my actual data set is much larger!)

x<-c(1,2,3)
y<-c(2,4,6)
z<-c(0.1,0.5,2)
combo<-expand.grid(x,y,z)
combo<-data.frame(combo)
names(combo)<-c("x","y","z")
outcome<-function(l)
{
(l[1]*l[2])/l[3]
}
resp<-apply(combo,1,outcome)
levelplot(resp~x*y|z,data=combo
,pretty=TRUE,region=TRUE,contour=FALSE)

, so in this final graph I want the z=0.1, z=0.5 and z=2 in turn.

Thanks,

Kieran Martin
University of Southampton

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