R: Number of Items

size {arules} | R Documentation

## Number of Items

### Description

Provides the generic function `size` and S4 methods to get the size of each element from objects based on `itemMatrix`. For example, it is used to get a vector of transaction sizes (i.e., the number of present items (ones) per element (row) of the binary incidence matrix) from an object of class `transactions`).

### Usage

    size(x, ...)

### Arguments

`x` | an object.
`...` | further (unused) arguments.

### Value

`size` returns a numeric vector of length `length(x)`. Each element is the size of the corresponding element (row in the matrix) in object `x`. For rules, `size` returns the sum of the number of elements in the LHS and the RHS.

### Author(s)

Michael Hahsler

### See Also

`itemMatrix-class`, `transactions-class`

### Examples

    data("Adult")
    summary(size(Adult))

[Package arules version 1.6-2 Index]