c_across function

Combine values from multiple columns

c_across() is designed to work with rowwise() to make it easy to perform row-wise aggregations. It has two differences from c():

• It uses tidy select semantics so you can easily select multiple variables. See vignette("rowwise") for more details.
• It uses vctrs::vec_c() in order to give safer outputs.

c_across(cols)

Arguments

• cols: <tidy-select> Columns to transform. You can't select grouping columns because they are already automatically handled by the verb (i.e. summarise() or mutate()).

Examples

df <- tibble(id = 1:4, w = runif(4), x = runif(4), y = runif(4), z = runif(4))
df %>%
  rowwise() %>%
  mutate(
    sum = sum(c_across(w:z)),
    sd = sd(c_across(w:z))
  )

See Also

across() for a function that returns a tibble.