[R] Keep only those values in a row in a data frame which occur only once.

S Ellison S.Ellison at LGCGroup.com
Mon Jun 12 15:54:18 CEST 2017

> I have a file data.txt as follows:
> Name_1,A,B,C
> Name_2,E,F
> Name_3,I,J,I,K,L,M
> My query is how can I keep only the unique elements in each row? For
> example: I want the row 3 to be Name_3,I,J,K,L,M
> Please note I don't want the 2nd I to appear.
> How can I do this?
Use unique() on each row and pad with NA?

uniq10 <- function(x, L=10) {
	u <- unique(x)
	c(u, rep(NA, L-length(u)) )

as.data.frame(  t( apply(tmp, 1, uniq10)  )  )

assuming tmp is the name of your initial data frame.

S Ellison

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