How can I add 1 to all integers in a dataset consiting integers and NAs (in R)?

Question

I have a dataset consisting of integers and NAs. I want to add 1 (+1) to all of the integers but not to the NAs. How can I do this? Thanks for your help!

Answer 1

Assuming your df is named df and var1 is the column you want to add 1 to:

df$var2 = df$var1 +1

where var2 will be the column having the final result.

PS Adding 1 to NA still returns NA.