dplyr::mutate to add multiple values

Question

There are a couple of issues about this on the dplyr Github repo already, and at least one related SO question, but none of them quite covers my question -- I think.

Answer 1

Here's a quick solution using data.table package instead

First, a little change to the function

get_binCI <- function(x,n) as.list(setNames(binom.test(x,n)$conf.int, c("lwr", "upr")))

Then, simply

library(data.table)
setDT(dd)[, get_binCI(x, n), by = .(x, n)]
#    x  n        lwr       upr
# 1: 3 10 0.06673951 0.6524529
# 2: 4 11 0.10926344 0.6920953