Sum of two Columns of Data Frame with NA Values

Question

I have a data frame with some NA values. I need the sum of two of the columns. If a value is NA, I need to treat it as zero.

a  b c d
1  2 3 4
5 NA 7 8
         


        

Answer 1

I hope that it may help you

Some cases you have a few columns that are not numeric. This approach will serve you both. Note that: c_across() for dplyr version 1.0.0 and later

df <- data.frame(
  TEXT = c("text1", "text2"), a = c(1,5), b = c(2, NA), c = c(3,7), d = c(4,8))

df2 <- df %>% 
  rowwise() %>% 
  mutate(e = sum(c_across(a:d), na.rm = TRUE))
# A tibble: 2 x 6
# Rowwise: 
# TEXT        a     b     c     d     e
#          
# 1 text1     1     2     3     4    10
# 2 text2     5    NA     7     8    20