Set Operations

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Description

Provides the generic functions and the S4 methods for the set operations union, intersect, setequal, setdiff and is.element on sets of associations (e.g., rules, itemsets) and itemMatrix.

Usage

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union(x, y)
intersect(x, y)
setequal(x, y)
setdiff(x, y)
is.element(el, set)

Arguments

x,y, el, set

sets of associations or itemMatrix objects.

Details

All S4 methods for set operations are defined for the class name "ANY" in the signature, so they should work for all S4 classes for which the following methods are available: match, length and unique.

Value

union, intersect, setequal and setdiff return an object of the same class as x and y.

is.element returns a logic vector of length el indicating for each element if it is included in set.

Author(s)

Michael Hahsler

See Also

associations-class, itemMatrix-class

Examples

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data("Adult")

## mine some rules
r <- apriori(Adult)

## take 2 subsets
r1 <- r[1:10]
r2 <- r[6:15]

union(r1,r2)
intersect(r1,r2)
setequal(r1,r2)

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