How do I sum across certain columns?

Question

I have a data frame called df that looks like this:

name score1 score2 score3
Joe     1      NA    3
Jane    NA     2     3

How do I make a column named sum that sums non-empty cells in score1, score2 and score3?

Jonas Tundo · Answer 1 · 2016-05-03T18:14:35.523

2

df$sum <- rowSums(df[,2:4], na.rm = TRUE)

edited May 03 '16 at 18:14

answered May 03 '16 at 18:14

Jonas Tundo

1 Answers1