Search code examples
rdataframeduplicatessubsetconditional-formatting

How to find duplicates in two columns only while another column is different

I want to find where two (or more) rows have the same x,y (location) but a different ID.

In the table below I would like to know about the last two rows only.

x y id
1 2 1
1 2 1
1 3 4
2 3 1
2 3 2 
# example data
x <- read.table(text = "x   y   id
1   2   1
1   2   1
1   3   4
2   3   1
2   3   2", header = TRUE)
Solution

  • Another way, using dplyr:

    x %>% 
  group_by(x, y) %>% 
  filter(n_distinct(id) > 1)

# A tibble: 2 x 3
# Groups:   x, y [1]
      x     y    id
  <int> <int> <int>
1     2     3     1
2     2     3     2