Philipp,
I would do the following with ggplot2:
# Set up data
require(ggplot2)
dat <- Orange
dat$group <- ifelse(dat$Tree%in%c('1','4','5'), 'A', 'B')
# Specify the ggplot group aesthetic as Tree
g1 <- ggplot(data = dat, aes(x = age, y = circumference, group=Tree))
# Specify the geom_point and geom_line colour aesthetics as group
g1 + geom_point(aes(colour = group)) + geom_line(aes(colour = group))
Is this what you are after?
Jeremy
Jeremy Hetzel
Boston University
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