How to create a vector indicating matches between the elements of one vector and any element in another?

Question

I am trying to create a vector indicating whether country names in a data frame match any value from a separate list.

The separate list of country names looks like t

Answer 1

How about

transform(df,match=as.numeric(country %in% list))

?

(I can't help pointing out that the %in% operator is covered on the R help page for the "match" function ...)