R. Do all x elements exist in Y

• Java

In R, how to test the elements of a vector that does not exist in another vector?

X <- c('a','b','c','d')
Y <- c('b','e','a','d','f','c')

I wonder if all the elements of X exist in Y? (true or false answer)

Solution

You want setdiff:

> setdiff(X,Y) # all elements present in X but not Y
character(0)

> length(setdiff(X,Y)) == 0
[1] TRUE
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