Replacing NAs in a column with the values of other column
You can use coalesce:
library(dplyr)df1 <- data.frame(Letters, Char, stringsAsFactors = F)df1 %>% mutate(Char1 = coalesce(Char, Letters)) Letters Char Char11 A a a2 B b b3 C <NA> C4 D d d5 E <NA> E