I first try these command, it works quite well.
library(lattice)
data(cuckoos)
levnam <- strsplit(levels(cuckoos$species), "\\.")
BUT, i want to try :
levnam <- strsplit(levels(cuckoos$species), ".")
to see the difference.
They maybe I modified the data file, because when I try again, it says:
> data(cuckoos)
Warning message:
data set 'cuckoos' not found in: data(cuckoos)
would you please tell me how to deal with this problem?
I have already tried update.packages()
it doesn't help.
Thanks.
DJ
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