bit (version 4.5.0.1)

bit_sort: bit sort

Description

fast sorting of integers

Usage

bit_sort(x, decreasing = FALSE, na.last = NA, has.dup = TRUE)

Value

a sorted vector

Arguments

x

an integer vector

decreasing

(currently only FALSE is supported)

na.last

NA removes NAs, FALSE puts NAs at the beginning, TRUE puts NAs at the end

has.dup

TRUE (the default) assumes that x might have duplicates, set to FALSE if duplicates are impossible

Details

determines the range of the integers and checks if the density justifies use of a bit vector; if yes, sorts the first occurences of each integer in the range using a bit vector, sorts the rest and merges; if no, falls back to quicksort.

See Also

sort, ramsort, bit_sort_unique

Examples

bit_sort(c(2L,1L,NA,NA,1L,2L))
bit_sort(c(2L,1L,NA,NA,1L,2L), na.last=FALSE)
bit_sort(c(2L,1L,NA,NA,1L,2L), na.last=TRUE)

if (FALSE) {
x <- sample(1e7, replace=TRUE)
system.time(bit_sort(x))
system.time(sort(x))
}