Subset with unique cases, based on multiple columns

Question

I\'d like to subset a dataframe to include only rows that have unique combinations of three columns. My situation is similar to the one presented in this question, but I\'d

Answer 1

Using dplyr you could do:

library(dplyr)

# distinct
df %>% 
  distinct(v1, v2, v3, .keep_all = T)

# non-distinct only
df %>% 
  group_by(v1, v2, v3) %>% 
  filter(n() > 1)

# exclude any non-distinct
df %>% 
  group_by(v1, v2, v3) %>% 
  filter(n() == 1)