[R] Create counter variable for subsets without a loop

Bart Joosen bartjoosen at hotmail.com
Tue May 18 12:22:05 CEST 2010

Solved it another way, without apply:

data2 <- data[order(data$state.region,-data$Population),]
cx <- as.numeric(data2$state.region)
data2$rank <- cumsum(rep(1,length(cx)))-match(cx,cx) + 1

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