bit: as.which – R documentation

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Documentation

bit

as.which

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)

which: method to coerce to which from which
NULL: method to coerce to zero length which from NULL
numeric: method to coerce to which from numeric
integer: method to coerce to which from integer
logical: method to coerce to which from logical
ri: method to coerce to which from ri
bit: method to coerce to which from bit
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

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