bit: bit_unidup – R documentation

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bit

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)

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

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))

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)

Functions

bit_unique: extracts unique elements
bit_duplicated: determines duplicate elements
bit_anyDuplicated: checks for existence of duplicate elements
bit_sumDuplicated: counts duplicate elements

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)

bit

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