Difference between two vectors in R

Question

Difference between two vectors in R

I have two vectors:

a <- c(1, 1, 3, 4, 5, 7, 9)
b <- c(2, 3, 4, 6, 8, 2)

I want to find numbers in the second vector that are not in the first vector:

dif <- c(2, 6, 8)

I've tried many different approaches (such as union, different types of connections (dplyr package), setdiff, compare (compare package)), but I still can't find a way to do this.

+3

diff vector r

Jot eN 22 jul. 15 at 20:11

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2 answers

An alternative way instead of setdiff

(which is probably preferred) is to use%in%

unique(b[! b %in% a])
#[1] 2 6 8

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nico 22 jul. 15 at 20:16

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akrun · Accepted Answer · 2015-07-22T20:12:28+0000

you can use setdiff

setdiff(b,a)
#[1] 2 6 8

Difference between two vectors in R

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