# Vector-setops

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

Perform set operations on Vector objects.

Keywords
methods
##### Usage
## S3 method for class 'Vector,Vector':
union(x, y)## S3 method for class 'Vector,Vector':
intersect(x, y)## S3 method for class 'Vector,Vector':
setdiff(x, y)## S3 method for class 'Vector,Vector':
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).

• Vector-comparisonfor comparing and ordering vector-like objects.
• Vectorobjects.
• BiocGenerics::union,BiocGenerics::intersect, andBiocGenerics::setdiffin theBiocGenericspackage 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 0.10.1, License: Artistic-2.0

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