unique unique "returns a vector, data frame, or array like x but with duplicate elements/rows removed. Examples Given a vector of values, how do I return a vector of values with all duplicates removed? Click to see solution vec <- c(1, 2, 3, 3, 3, 4, 5, 5, 6) unique(vec) [1] 1 2 3 4 5 6 grep paste & paste0