R: Getting the Number of Elements

length {arules} | R Documentation

## 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 signature 'rules'
    length(x)

    ## S4 method for signature 'itemsets'
    length(x)

    ## S4 method for signature 'tidLists'
    length(x)

    ## S4 method for signature 'itemMatrix'
    length(x)

### Arguments

`x` | an object of class `transactions`, `rules`, `itemsets`, `tidLists`, or `itemMatrix`.

### 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.

### Value

An integer scalar giving the “length” of `x`.

### Author(s)

Michael Hahsler

[Package arules version 1.6-7 Index]