R: Determine Duplicate Elements of integer64

duplicated.integer64 {bit64} | R Documentation

## Determine Duplicate Elements of integer64

### Description

`duplicated()` determines which elements of a vector or data frame are duplicates of elements with smaller subscripts, and returns a logical vector indicating which elements (rows) are duplicates.

### Usage

    ## S3 method for class 'integer64'
    duplicated(x, incomparables = FALSE, nunique = NULL, method = NULL, ...)

### Arguments

`x` | a vector or a data frame or an array or `NULL`.
`incomparables` | ignored
`nunique` | NULL or the number of unique values (including NA). Providing `nunique` can speed-up matching when `x` has no cache. Note that a wrong nunique can cause undefined behaviour up to a crash.
`method` | NULL for automatic method selection or a suitable low-level method, see details
`...` | ignored

### Details

This function automatically chooses from several low-level functions considering the size of `x` and the availability of a cache.

Suitable methods are `hashdup` (hashing), `sortorderdup` (fast ordering) and `orderdup` (memory saving ordering).

### Value

`duplicated()`: a logical vector of the same length as `x`.

### Author(s)

Jens Oehlschlägel <Jens.Oehlschlaegel@truecluster.com>

### See Also

`duplicated`, `unique.integer64`

### Examples

    x <- as.integer64(sample(c(rep(NA, 9), 1:9), 32, TRUE))
    duplicated(x)

    stopifnot(identical(duplicated(x),  duplicated(as.integer(x))))

[Package bit64 version 0.9-7 Index]