bit (version 4.6.0)

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)