arules (version 1.6-1)

length: Getting the Number of Elements

Description

S4 methods for length which return the number of elements of objects defined in the package arules.

Usage

# S4 method for rules
length(x)
# S4 method for itemsets
length(x)
# S4 method for tidLists
length(x)
# S4 method for itemMatrix
length(x)

Arguments

x

an object of class '>transactions, '>rules, '>itemsets, '>tidLists, or '>itemMatrix.

Value

An integer scalar giving the “length” of x.

Details

For '>itemMatrix and '>transactions the length is defined as the number of rows (transactions) in the binary incidence matrix.

For sets of associations ('>rules, '>itemsets and '>associations in general) the length is defined as the number of elements in the set (i.e., the number of rules or itemsets).

For '>tidLists the length is the number of lists (one per item or itemset) in the object.