See if this works for you.
a <- c(2,1,1,3,3,3,4)
a.fac <- as.factor(a)
b <- split(a, f = a.fac)
system.time(lapply(X = b, FUN = function(x) {
swn <- seq(from = 0, to = 0 + 0.01*length(x), by = 0.01)
out <- x + swn
return(out)
}))
Cheers,
Roman
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