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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 the numbers in the second vector, which are not in the first vector:
dif <- c(2, 6, 8)
I've tried many different approaches (such as merge, different types of joins (dplyr package), setdiff, compare (compare package)), but I still can't find a way to do it.
922
Method 1: Using setdiff() method The setdiff() method in R is used to retrieve the elements of vector X, which are not contained in Y. This method can be applied where the two vectors may belong to different data types, as well, where the elements of the first argument vector are returned unmodified.
Hey Latha, The difference between them is that [[ ]] is used to access a component in a list or matrix whereas [ ] is used to access a single element in a matrix or array.
You can use setdiff
setdiff(b,a)
#[1] 2 6 8
An alternative way, instead of setdiff (which is probably preferrable), is to use %in%
unique(b[! b %in% a])
#[1] 2 6 8
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