Another approach using latticeExtra, more ggplot2-like:
p <- xyplot(matter~year|plot,type="l")
p +
latticeExtra::layer(panel.abline(v=1995))
On 20 Feb 2009, at 09:34, Chris Bennett wrote:
Hi,
I want to add a dashed vertical line to a number of xyplots.
Here is a simple script of the type of plot I have but then I want
to add a
reference line to 1995 on each of the panels. I have tried
panel.abline and
other suggestions on the forum but can't get it to work.
plot<-rep(letters[1:3],each=10)
year<-rep(1991:2000,times=3)
matter<-rep(seq(2,6.5,0.5),times=3)
xyplot(matter~year|plot,type="l")
Cheers,
Chris
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