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 = everything())
cols |
< |
across() for a function that returns a tibble.
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))
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