Delete all repeated values

Question

If I have a vector:

x <- c(5, 6, 2, 9, 5, 2, 1, 9, 9)

How can I make another vector that contains elements that were never repeated? In this case it would be: c(6, 1) (because 5, 2, and 9 are repeated)

You're asking about a vector while the linked question is for a data.frame, but the answer seems to apply fine both places. — Frank, Jul 21 '16 at 21:58

score 5 · Accepted Answer · answered Jul 21 '16 at 20:45

5

test <- c(5, 6, 2, 9, 5, 2, 1, 9, 9)
setdiff(test, test[duplicated(test)])

answered Jul 21 '16 at 20:45

graggsd

186
7

score -1 · Answer 2 · answered Jul 21 '16 at 21:54

-1

vector.a <- c(5, 6, 2, 9, 5, 2, 1, 9, 9)

not.reap <- NULL
for (i in 1:length(vector.a)){
  not.reap[i] <- !(vector.a[i] %in% vector.a[-i])
}
vector.a[not.reap]

answered Jul 21 '16 at 21:54

s_baldur

29,441
4
36
69

Delete all repeated values

2 Answers2