Replacing NAs in a column with the values of other column

Question

I wonder how to replace NAs in a column with the values of other column in R using dplyr. MWE is below.

Letters <- LETT         


        

Answer 1

You can use coalesce:

library(dplyr)

df1 <- data.frame(Letters, Char, stringsAsFactors = F)

df1 %>%
  mutate(Char1 = coalesce(Char, Letters))

  Letters Char Char1
1       A    a     a
2       B    b     b
3       C      C
4       D    d     d
5       E      E