I'm trying to add a set of reference lines to a multipanel xyplot
xyplot(y ~ x | Visit,
panel = function(x, y, ...){
panel.xyplot(x, y, ...)
abline(v = c(0.5, 1))
})
However, the reference lines are different for different visits. For
example, for the first 2 visits, I'd like vertical lines at x = 0.5 and 1.
For visits 3 and four, I'd like vertical lines at x = 1 and 1.5. I can use
abline within the panel function, but I haven't found a way to say I want my
reference lines to change for different visits.
I've a feeling that the subscripts arguement is somehow involved, but I've
not found any examples or references to this.
Any suggestions? Which page of the various manuals did I skim too quickly?
Thanks,
Rob
-- Robert Balshaw, Ph.D.
-- Senior Biostatistician, Syreon Corp.
-- Phone: 604.676.5900x220; Fax: 604.676.5911
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