Set operations on vectorlike objects
Description
Perform set operations on Vector objects.
Usage
1 2 3 4 5 6 7 8 9 10 11 
Arguments
x, y 
Vectorlike objects. 
Details
The union
, intersect
, and setdiff
methods for
Vector objects return a Vector object containing respectively
the union, intersection, and (asymmetric!) difference of the 2 sets of
vector elements in x
and y
.
The setequal
method for Vector objects checks for set
equality between x
and y
.
They're defined as follow:
1 2 3 4 5 6 7 8 9 10 11 12 13  setMethod("union", c("Vector", "Vector"),
function(x, y) unique(c(x, y))
)
setMethod("intersect", c("Vector", "Vector"),
function(x, y) unique(x[x %in% y])
)
setMethod("setdiff", c("Vector", "Vector"),
function(x, y) unique(x[!(x %in% y)])
)
setMethod("setequal", c("Vector", "Vector"),
function(x, y) all(x %in% y) && all(y %in% x)
)

so they work outofthebox on Vector objects for which c
,
unique
, and %in%
are defined.
Value
union
returns a Vector object obtained by appending to x
the elements in y
that are not already in x
.
intersect
returns a Vector object obtained by keeping only
the elements in x
that are also in y
.
setdiff
returns a Vector object obtained by dropping from
x
the elements that are in y
.
setequal
returns TRUE
if x
and y
contain the
same sets of vector elements and FALSE
otherwise.
union
, intersect
, and setdiff
propagate the names and
metadata columns of their first argument (x
).
Author(s)
Hervé Pagès
See Also

Vectorcomparison for comparing and ordering vectorlike objects.

Vectormerge for merging vectorlike objects.

Vector objects.

BiocGenerics::union
,BiocGenerics::intersect
, andBiocGenerics::setdiff
in the BiocGenerics package for general information about these generic functions.
Examples
1  ## See ?`Hitssetops` for some examples.
