arules (version 0.3-1)

match: Value Matching

Description

Provides the generic function match and the S4 methods for associations and transactions. match returns a vector of the positions of (first) matches of its first argument in its second.

Usage

match(x,  table, nomatch = NA, incomparables = FALSE)

Arguments

x

an object of class itemMatrix, transactions or associations.

table

a set of associations or transactions to be matched against.

nomatch

the value to be returned in the case when no match is found.

incomparables

not implemented.

Value

• An integer vector of the same length as x giving the position in table of the first match if there is a match, otherwise nomatch.

See Also

unique, duplicated, rules-class, itemsets-class, itemMatrix-class

Examples

data("Adult")

### get unique transactions
vals <- unique(Adult)

### count frequency of unique transactions
cnts <- tabulate(match(Adult, vals))

### plot frequency of unique transactions
plot(sort(cnts, decreasing=TRUE))