Counting non NAs in a data frame; getting answer as a vector

Question

Say I have the following R data.frame ZZZ:

( ZZZ <- structure(list(n = c(1, 2, NA), m = c(6, NA, NA), o = c(7, 8, 
8)), .Names = c(\         


        

Answer 1

If you only want the sum total of NAs overall, then sum() with !is.na() will do it:

ZZZ <- data.frame(n = c(1, 2, NA), m = c(6, NA, NA), o = c(7, 8, 8))
sum(!is.na(ZZZ))