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rle on large data . . . without a for loop!

Justin <jtor14 <at> gmail.com> writes:
... its friday and im sleepy!...

dat<-data.frame(id=rep(1:5,each=200),state=sample(1:3,
1000,replace=T,prob=c(0.7,0.05,0.25)),V1=runif(1,10,1000),V2=rnorm(1000))