dplyr::mutate (assign na.rm =TRUE)

Question

I have a data.frame that has 100 variables. I want to get the sum of three variables only using mutate (not summarise).

If there is NA in a

Answer 1

rowwise() is my go-to function. It's like group_by() but it treats each row as an individual group.

df %>% rowwise() %>% mutate(Sum = sum(c(var1, var2, var3), na.rm = TRUE))