Find elements not in smaller character vector list but in big list

Question

I have the two big and small list. I want to know which of the elements in big list are not in smaller list. The list consists of property

([1] \"character\"         


        

Answer 1

! only works on logical vectors. B is not logical, which is what causes the error. Decomposing the steps you're trying to make will show you this (i.e. !B). In this case, you want to use %in% (or match).

A[!A %in% B]

To decompose the above code:

1. A %in% B creates a logical vector that is TRUE for values of A that exist in B.
2. !A %in% B negates (reverses) the logic in (1)
3. A[!A %in% B] returns the vector of elements that are TRUE in (2)