Fastest way to remove all duplicates in R

Question

I\'d like to remove all items that appear more than once in a vector. Specifically, this includes character, numeric and integer vectors. Currently, I\'m using duplica

Answer 1

You could use a set operation:

d <- c(1,2,3,4,1,5,6,4,2,1)
duplicates = d[duplicated(d)]
setdiff(d, duplicates)
[1] 3 5 6

(Not certain if that is more efficient than the above code but it does seem conceptually cleaner)