Extract {bit} | R Documentation |
Extract or replace part of an boolean vector
Description
Operators acting on bit()
or bitwhich()
objects to extract or replace parts.
Usage
## S3 method for class 'bit'
x[[i]]
## S3 replacement method for class 'bit'
x[[i]] <- value
## S3 method for class 'bit'
x[i]
## S3 replacement method for class 'bit'
x[i] <- value
## S3 method for class 'bitwhich'
x[[i]]
## S3 replacement method for class 'bitwhich'
x[[i]] <- value
## S3 method for class 'bitwhich'
x[i]
## S3 replacement method for class 'bitwhich'
x[i] <- value
Arguments
x |
a |
i |
preferrably a positive integer subscript or a |
value |
new logical or integer values |
Details
The typical usecase for '[' and '[<-' is subscripting with positive integers,
negative integers are allowed but slower,
as logical subscripts only scalars are allowed.
The subscript can be given as a bitwhich()
object.
Also ri()
can be used as subscript.
Extracting from bit()
and bitwhich()
is faster than from logical()
if positive
subscripts are used. Unteger subscripts make sense. Negative subscripts are
converted to positive ones, beware the RAM consumption.
Value
The extractors [[
and [
return a logical scalar or
vector. The replacment functions return an object of class(x)
.
Author(s)
Jens Oehlschlägel
See Also
Examples
x <- as.bit(c(FALSE, NA, TRUE))
x[] <- c(FALSE, NA, TRUE)
x[1:2]
x[-3]
x[ri(1, 2)]
x[as.bitwhich(c(TRUE, TRUE, FALSE))]
x[[1]]
x[] <- TRUE
x[1:2] <- FALSE
x[[1]] <- TRUE