R: Remove Duplicated Elements from a Collection

unique {arules} | R Documentation

## Remove Duplicated Elements from a Collection

### Description

Provides the generic function `unique` and the S4 methods for `itemMatrix`. `unique` uses `duplicated` to return an `itemMatrix` with the duplicate elements removed.

Note that `unique` can also be used on collections of `associations`.

### Usage

    unique(x, incomparables = FALSE, ...)

### Arguments

`x` | an object of class `itemMatrix` or associations.
`...` | further arguments (currently unused).
`incomparables` | currently unused.

### Value

An object of the same class as `x` with duplicated elements removed.

### Author(s)

Michael Hahsler

### See Also

`duplicated`, `associations-class`, `itemMatrix-class`

### Examples

    data("Adult")

    r1 <- apriori(Adult[1:1000], parameter = list(support = 0.5))
    r2 <- apriori(Adult[1001:2000], parameter = list(support = 0.5))

    ## Note that this produces a collection of rules from two sets
    r_comb <- c(r1, r2)
    r_comb <- unique(r_comb)
    r_comb

[Package arules version 1.7-2 Index]