as.which: Coercion to (positive) integer positions

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

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

See Also

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

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))))

truecluster/bit documentation built on Nov. 20, 2022, 2:34 a.m.