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

Another very simple solution in this case is to use the rowSums function.

df$New<-rowSums(df[, c("A", "B")], na.rm=T)
df<-df[, c("ID", "New")]

Update: Thanks @Artem Klevtsov for mentioning that this method only works with numeric data.