as.which: Coercion to (positive) integer positions
In bit: Classes and Methods for Fast Memory-Efficient Boolean Selections

as.which.which

R Documentation

Coercion to (positive) integer positions

Description

Coercing to something like the result of which which()

Usage

## S3 method for class 'which'
as.which(x, maxindex = NA_integer_, ...)

## S3 method for class ''NULL''
as.which(x, ...)

## S3 method for class 'numeric'
as.which(x, maxindex = NA_integer_, ...)

## S3 method for class 'integer'
as.which(x, maxindex = NA_integer_, is.unsorted = TRUE, has.dup = TRUE, ...)

## S3 method for class 'logical'
as.which(x, ...)

## S3 method for class 'ri'
as.which(x, ...)

## S3 method for class 'bit'
as.which(x, range = NULL, ...)

## S3 method for class 'bitwhich'
as.which(x, ...)

as.which(x, ...)

Arguments

`x`	an object of classes `bit()`, `bitwhich()`, `ri()` or something on which `which()` works
`maxindex`	the length of the boolean vector which is represented
`...`	further arguments (passed to `which()` for the default method, ignored otherwise)
`is.unsorted`	a logical scalar indicating whether the data may be unsorted
`has.dup`	a logical scalar indicating whether the data may have duplicates
`range`	a `ri()` or an integer vector of length == 2 giving a range restriction for chunked processing

Details

as.which.bit returns a vector of subscripts with class 'which'

Value

a vector of class 'logical' or 'integer'

Methods (by class)

as.which(which): method to coerce to which() from which()
as.which(`NULL`): method to coerce to zero length which() from NULL
as.which(numeric): method to coerce to which() from numeric()
as.which(integer): method to coerce to which() from integer()
as.which(logical): method to coerce to which() from logical()
as.which(ri): method to coerce to which() from ri()
as.which(bit): method to coerce to which() from bit()
as.which(bitwhich): method to coerce to which() from bitwhich()

Author(s)

Jens Oehlschlägel

Examples


  r <- ri(5, 20, 100)
  x <- as.which(r)
  x

  stopifnot(identical(x, as.which(as.logical(r))))
  stopifnot(identical(x, as.which(as.bitwhich(r))))
  stopifnot(identical(x, as.which(as.bit(r))))

bit documentation built on April 4, 2025, 3:09 a.m.