bit: CoercionToStandard – R documentation

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bit

CoercionToStandard

Coercion from bit, bitwhich, which and ri to logical, integer, double

Description

Coercion from bit is quite fast because we use a double loop that fixes each word in a processor register.

Usage

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

## S3 method for class 'bit'
as.integer(x, ...)

## S3 method for class 'bit'
as.double(x, ...)

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

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

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

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

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

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

## S3 method for class 'which'
as.logical(x, length = attr(x, "maxindex"), ...)

Arguments

`x`	an object of class `bit`, `bitwhich` or `ri`
`...`	ignored
`length`	length of the boolean vector (required for `as.logical.which`)

Value

as.logical returns a vector of FALSE, TRUE, as.integer and as.double return a vector of 0,1.

Author(s)

Jens Oehlschlägel

Examples

x <- ri(2, 5, 10)
  y <- as.logical(x)
  y
  stopifnot(identical(y, as.logical(as.bit(x))))
  stopifnot(identical(y, as.logical(as.bitwhich(x))))

  y <- as.integer(x)
  y
  stopifnot(identical(y, as.integer(as.logical(x))))
  stopifnot(identical(y, as.integer(as.bit(x))))
  stopifnot(identical(y, as.integer(as.bitwhich(x))))

  y <- as.double(x)
  y
  stopifnot(identical(y, as.double(as.logical(x))))
  stopifnot(identical(y, as.double(as.bit(x))))
  stopifnot(identical(y, as.double(as.bitwhich(x))))

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