as.bit: Coercing to bit

In bit: A Class for Vectors of 1-Bit Booleans

Description

Coercing to bit vector

Usage

as.bit(x, ...)
## S3 method for class 'bit'
as.bit(x, ...)
## S3 method for class 'logical'
as.bit(x, ...)
## S3 method for class 'integer'
as.bit(x, ...)
## S3 method for class 'bitwhich'
as.bit(x, ...)
## S3 method for class 'which'
as.bit(x, length, ...)
## S3 method for class 'ri'
as.bit(x, ...)

Arguments

x	an object of class bit, logical, integer, bitwhich or an integer from as.which or a boolean ff
length	the length of the new bit vector
...	further arguments

Details

Coercing to bit is quite fast because we use a double loop that fixes each word in a processor register

Value

is.bit returns FALSE or TRUE, as.bit returns a vector of class 'bit'

Note

Zero is coerced to FALSE, all other numbers including NA are coerced to TRUE. This differs from the NA-to-FALSE coercion in package ff and may change in the future.

Author(s)

Jens Oehlschlägel

See Also

bit, as.logical

Examples

  x <- as.bit(c(FALSE, NA, TRUE))
  as.bit(x)
  as.bit.which(c(1,3,4), 12)

Example output

Attaching package bit
package:bit (c) 2008-2012 Jens Oehlschlaegel (GPL-2)
creators: bit bitwhich
coercion: as.logical as.integer as.bit as.bitwhich which
operator: ! & | xor != ==
querying: print length any all min max range sum summary
bit access: length<- [ [<- [[ [[<-
for more help type ?bit

Attaching package: 'bit'

The following object is masked from 'package:base':

    xor

bit length=3 occupying only 1 integers
    1     2     3 
FALSE  TRUE  TRUE 
bit length=12 occupying only 1 integers
    1     2     3     4     5     6     7     8     9    10    11    12 
 TRUE FALSE  TRUE  TRUE FALSE FALSE FALSE FALSE FALSE FALSE FALSE FALSE 

bit documentation built on May 2, 2019, 4:48 p.m.