itemwiseSetOps {arules}

Itemwise Set Operations

Description

Provides the generic functions and the methods for itemwise set operations on items in an itemMatrix. The regular set operations regard each itemset in an itemMatrix as an element. Itemwise operations regard each item as an element and operate on the items of pairs of corresponding itemsets (first itemset in x with first itemset in y, second with second, etc.).

Usage

itemUnion(x, y)

itemSetdiff(x, y)

itemIntersect(x, y)

## S4 method for signature 'itemMatrix,itemMatrix'
itemUnion(x, y)

## S4 method for signature 'itemMatrix,itemMatrix'
itemSetdiff(x, y)

## S4 method for signature 'itemMatrix,itemMatrix'
itemIntersect(x, y)

Arguments

x, y

two itemMatrix objects with the same number of rows (itemsets).

Value

An object of class itemMatrix is returned.

Author(s)

Michael Hahsler

Examples

data("Adult")

fsets <- eclat(Adult, parameter = list(supp = 0.5))
inspect(fsets[1:4])
inspect(itemUnion(items(fsets[1:2]), items(fsets[3:4])))
inspect(itemSetdiff(items(fsets[1:2]), items(fsets[3:4])))
inspect(itemIntersect(items(fsets[1:2]), items(fsets[3:4])))