bit: firstNA – R documentation

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firstNA

Position of first NA

This is substantially faster than which.max(is.na(x))

firstNA(x)

`x`	an R vector

a reversed vector

x <- c(FALSE,NA,TRUE)
firstNA(x)
reverse_vector(x)
## Not run: 
x <- 1:1e7
system.time(rev(x))
system.time(reverse_vector(x))

## End(Not run)

Classes and Methods for Fast Memory-Efficient Boolean Selections

v4.0.4

GPL-2 | GPL-3

Authors

Jens Oehlschlägel [aut, cre], Brian Ripley [ctb]

Initial release

2020-08-03