Determine the number of rows with NAs

Question

I have a data frame as follows:

     col1   col2    col3
 1    23    17      NA
 2    55    NA      NA
 3    24    12      13
 4    34    23      12

Answer 1

Another solution:

data <- read.table(text='col1   col2    col3
    23    17      NA
    55    NA      NA
    24    12      13
    34    23      12', header=T)

sum(apply(is.na(data[, -1]), 1, any))