bit (version 4.0.5)

xor.default: Boolean operators and functions

Description

Boolean NEGATION '!', AND '&', OR '|' and EXCLUSIVE OR xor', see Logic.

Usage

# S3 method for default
xor(x, y)
# S3 method for logical
xor(x, y)
# S3 method for bit
!(x)
# S3 method for bit
&(e1, e2)
# S3 method for bit
|(e1, e2)
# S3 method for bit
==(e1, e2)
# S3 method for bit
!=(e1, e2)
# S3 method for bit
xor(x, y)
# S3 method for bitwhich
!(x)
# S3 method for bitwhich
&(e1, e2)
# S3 method for bitwhich
|(e1, e2)
# S3 method for bitwhich
==(e1, e2)
# S3 method for bitwhich
!=(e1, e2)
# S3 method for bitwhich
xor(x, y)
# S3 method for booltype
&(e1, e2)
# S3 method for booltype
|(e1, e2)
# S3 method for booltype
==(e1, e2)
# S3 method for booltype
!=(e1, e2)
# S3 method for booltype
xor(x, y)
xor(x, y)

Value

An object of class booltype or logical

Arguments

x

a is.booltype vector

y

a is.booltype vector

e1

a is.booltype vector

e2

a is.booltype vector

Methods (by class)

• default: default method for xor

• logical: logical method for xor

• bit: bit method for !

• bit: bit method for &

• bit: bit method for |

• bit: bit method for ==

• bit: bit method for !=

• bit: bit method for xor

• bitwhich: bitwhich method for !

• bitwhich: bitwhich method for &

• bitwhich: bitwhich method for |

• bitwhich: bitwhich method for ==

• bitwhich: bitwhich method for !=

• bitwhich: bitwhich method for xor

• booltype: booltype method for &

• booltype: booltype method for |

• booltype: booltype method for ==

• booltype: booltype method for !=

• booltype: booltype method for xor

Author

Jens Oehlschlägel

Details

The binary operators and function xor can now combine any is.booltype vectors. They now recycle if vectors have different length. If the two arguments have different booltypes the return value corresponds to the lower booltype of the two.

Boolean operations on bit vectors are extremely fast because they are implemented using C's bitwise operators. Boolean operations on or bitwhich vectors are even faster, if they represent very skewed selections.

The xor function has been made generic and xor.default has been implemented much faster than R's standard xor. This was possible because actually boolean function xor and comparison operator != do the same (even with NAs), and != is much faster than the multiple calls in (x | y) & !(x & y)

See Also

booltypes, Logic

Examples

  x <- c(FALSE, FALSE, FALSE, NA, NA, NA, TRUE, TRUE, TRUE)
  y <- c(FALSE, NA, TRUE, FALSE, NA, TRUE, FALSE, NA, TRUE)
  
  x|y
  x|as.bit(y)
  x|as.bitwhich(y)
  x|as.which(y)
  x|ri(1,1,9)
  
  

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