# Vector-setops

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##### Set operations on vector-like objects

Perform set operations on Vector objects.

Keywords
methods
##### Usage
"union"(x, y)
"intersect"(x, y)
"setdiff"(x, y)
"setequal"(x, y)
##### Arguments
x, y
Vector-like 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:

    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 out-of-the-box 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).

##### See Also

• Vector-comparison for comparing and ordering vector-like objects.

• Vector objects.

• BiocGenerics::union, BiocGenerics::intersect, and BiocGenerics::setdiff in the BiocGenerics package for general information about these generic functions.

##### Aliases
• Vector-setops
• union,Vector,Vector-method
• intersect,Vector,Vector-method
• setdiff,Vector,Vector-method
• setequal,Vector,Vector-method
##### Examples
## See ?Hits-setops for some examples.

Documentation reproduced from package S4Vectors, version 0.10.2, License: Artistic-2.0

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