When at, label chains contain duplicate at values, axis ticks are
dropped. I believe this is handled incorrectly for Date ats in
lattice 0.15-4 when compared to how it is handled for numeric, or for
dates in base plot. This can result in mis-labelled axes in some
circumstances. I have included executable examples.
R: 2.5.0
numeric base plot:
plot(1:10, axes=F); axis(1, at=c(2,4,4,6), labels=letters[1:4])
shows labels a, b, d
date scale in base plot:
plot((as.Date("2007-01-01") + 1:10), 1:10, axes=F); axis(1, at=
(as.Date("2007-01-01")+c(2,4,4,6)), labels=letters[1:4])
shows labels a, b, d
numeric scale in lattice plot
xyplot(1:10 ~ 1:10, scales=list(x=list(relation="free", at=c
(2,4,4,6), labels=list(letters[1:4]))))
shows labels a, b, d
date scale in lattice plot
xyplot(1:10 ~ (as.Date("2007-01-01") + 1:10) , scales=list(x=list
(relation="free", at=list(as.Date("2007-01-01")+c(2,4,4,6)),
labels=list(letters[1:4]))))
shows labels a, b, c
Since this results in label c being placed at position 6, not 4, I
feel this is a bug.
-Alex Brown
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