CoercionToStandard: Coercion from bit, bitwhich, which and ri to logical,...

In bit: Classes and Methods for Fast Memory-Efficient Boolean Selections

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

See Also

CoercionToStandard, as.booltype, as.bit, as.bitwhich , as.which, as.ri, as.hi, as.ff

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 documentation built on Sept. 20, 2024, 5:08 p.m.