bit (version 4.5.0)

bit_unidup: bit unique and duplicated

Description

Fast versions of unique, duplicated , anyDuplicated and sum(duplicated(x)) for integers.

Usage

bit_unique(x, na.rm = NA, range_na = NULL)
bit_duplicated(x, na.rm = NA, range_na = NULL, retFUN = as.bit)
bit_anyDuplicated(x, na.rm = NA, range_na = NULL)
bit_sumDuplicated(x, na.rm = NA, range_na = NULL)

Value

bit_unique returns a vector of unique integers,

bit_duplicated returns a boolean vector coerced to retFUN,

bit_anyDuplicated returns the position of the first duplicate (or zero if no duplicates)

bit_sumDuplicated returns the number of duplicated values (as.integer)

Arguments

x

an integer vector

na.rm

NA treats NAs like other integers, TRUE treats all NAs as duplicates, FALSE treats no NAs as duplicates

range_na

NULL calls range_na, optionally the result of range_na can be given here to avoid calling it again

retFUN

a function that coerces bit and logical vectors

Functions

• bit_unique(): extracts unique elements

• bit_duplicated(): determines duplicate elements

• bit_anyDuplicated(): checks for existence of duplicate elements

• bit_sumDuplicated(): counts duplicate elements

Details

determines the range of the integers and checks if the density justifies use of a bit vector; if yes, uses a bit vector for finding duplicates; if no, falls back to unique, duplicated, anyDuplicated and sum(duplicated(x))

See Also

bit_sort_unique

Examples

bit_unique(c(2L,1L,NA,NA,1L,2L))
bit_unique(c(2L,1L,NA,NA,1L,2L), na.rm=FALSE)
bit_unique(c(2L,1L,NA,NA,1L,2L), na.rm=TRUE)

bit_duplicated(c(2L,1L,NA,NA,1L,2L))
bit_duplicated(c(2L,1L,NA,NA,1L,2L), na.rm=FALSE)
bit_duplicated(c(2L,1L,NA,NA,1L,2L), na.rm=TRUE)

bit_anyDuplicated(c(2L,1L,NA,NA,1L,2L))
bit_anyDuplicated(c(2L,1L,NA,NA,1L,2L), na.rm=FALSE)
bit_anyDuplicated(c(2L,1L,NA,NA,1L,2L), na.rm=TRUE)

bit_sumDuplicated(c(2L,1L,NA,NA,1L,2L))
bit_sumDuplicated(c(2L,1L,NA,NA,1L,2L), na.rm=FALSE)
bit_sumDuplicated(c(2L,1L,NA,NA,1L,2L), na.rm=TRUE)