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 = 'red')
print(p)
key = c('below' = "blue", 'above' = "red")
p = p + scale_color_manual("Direction", values = key)
print(p)
> sessionInfo()
R version 2.12.1 (2010-12-16)
Platform: i386-pc-mingw32/i386 (32-bit)
locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[1] grid stats graphics grDevices utils datasets methods
[8] base
other attached packages:
[1] ggplot2_0.8.9 proto_0.3-8 reshape_0.8.4 plyr_1.4
loaded via a namespace (and not attached):
[1] tools_2.12.1
>
# on Windows XP
> version
_
platform i386-pc-mingw32
arch i386
os mingw32
system i386, mingw32
status
major 2
minor 12.1
year 2010
month 12
day 16
svn rev 53855
language R
version.string R version 2.12.1 (2010-12-16)
>
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