Find duplicated elements with dplyr

Question

I tried using the code presented here to find ALL duplicated elements with dplyr like this:

library(dplyr)

mtcars %>%
mutate(cyl.dup = cyl[duplicated(cyl         


        

Answer 1

We can find duplicated elements with dplyr as follows.

library(dplyr)

# Only duplicated elements
mtcars %>%
  filter(duplicated(.[["carb"]])

# All duplicated elements
mtcars %>%
  filter(carb %in% unique(.[["carb"]][duplicated(.[["carb"]])]))