Comparing character vectors in R to find unique and/or missing values

Question

I have two character vectors, x and y.

x <- c(\"a\", \"b\", \"c\", \"d\", \"e\", \"f\", \"g\")
y <- c(\"a\",      \"c\", \"d\", \"e\",      \"g\")
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Answer 1

I think this should work:

x[!(x %in% y)]

First it checks for all x that are not in y, then it uses that as an index on the original.

Answer 2

setdiff(x,y)

Will do the job for you.

Answer 3

> x[!x %in% y]
[1] "b" "f"

or:

> x[-match(y,x)]
[1] "b" "f"
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