duplicates_across_cols {assertr}R Documentation

Checks if row contains at least one value duplicated in its column


This function will return a vector, with the same length as the number of rows of the provided data frame. Each element of the vector will be logical value that states if any value from the row was duplicated in its column.


duplicates_across_cols(data, allow.na = FALSE)



A data frame


TRUE if we allow NAs in data. Default FALSE.


A logical vector.

See Also



df <- data.frame(v1 = c(1, 1, 2, 3), v2 = c(4, 5, 5, 6))

library(magrittr)            # for piping operator

# you can use "assert_rows", "in_set", and this function to
# check if specified variables set and all subsets are keys for the data.

correct_df <- data.frame(id = 1:5, sub_id = letters[1:5], work_id = LETTERS[1:5])
correct_df %>%
  assert_rows(duplicates_across_cols, in_set(FALSE), id, sub_id, work_id)
  # passes because each subset of correct_df variables is key

## Not run: 
incorrect_df <- data.frame(id = 1:5, sub_id = letters[1:5], age = c(10, 20, 20, 15, 30))
incorrect_df %>%
  assert_rows(duplicates_across_cols, in_set(FALSE), id, sub_id, age)
  # fails because age is not key of the data (age == 20 is placed twice)

## End(Not run)

[Package assertr version 3.0.1 Index]