num_na {timeplyr}

Fast number of missing values

Description

A faster and more efficient alternative to sum(is.na(x)).
Long vectors, i.e vectors with length >= 2^31 are also supported.

Usage

num_na(x)

Arguments

x

A vector.

Value

Number of NA values.

Examples

library(timeplyr)
library(bench)

flights <- nycflights13::flights

# num_na is more efficient than using `sum(is.na())`
mark(vapply(flights, num_na, integer(1)),
     vapply(flights, function(x) sum(is.na(x)), integer(1)),
     iterations = 10)