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huron
2011 Jan 30
2
ggplot2 -- scale_colour_manual()
According to Hadley's ggplot book (p. 109), both the graphs below should have a legend, and yet none appears in my hands.
Any suggestions? I can't see a typo. Is there a bug?
library(ggplot2)
data(LakeHuron)
huron = data.frame(year=1875:1972,level=LakeHuron)
p = ggplot(huron, aes(year)) +
geom_line(aes(y= level - 5), colour = 'blue') +
geom_line(aes(y= level + 5), colour