Merging two columns into one in R

Question

I have the following data frame, and am trying to merge the two columns into one, while replacing NA\'s with the numeric values.

ID    A     B
1         


        

Answer 1

This probably didn't exist when the answers were written, but since I came here with the same question and found a better solution, here it is for future googlers:

What you want is the coalesce() function from dplyr:

y <- c(1, 2, NA, NA, 5)
z <- c(NA, NA, 3, 4, 5)
coalesce(y, z)

[1] 1 2 3 4 5