[R] Finding (swapped) repetitions of numbers pairs across two columns

Marc Schwartz marc_schwartz at me.com
Thu Dec 27 21:59:56 CET 2012

Yep. There are methods for:

> methods(unique)
[1] unique.array           unique.data.frame      unique.default        
[4] unique.matrix          unique.numeric_version unique.POSIXlt   

and for the matrix and data.frame methods, unique rows will be returned by default. For array and matrix objects, you can change the MARGIN argument to a different value (eg. 2 for columns, etc.).

See ?unique for more information, notably the Details and Value sections.


On Dec 27, 2012, at 2:48 PM, Emmanuel Levy <emmanuel.levy at gmail.com> wrote:

> I did not know that unique worked on entire rows!
> That is great, thank you very much!
> Emmanuel
> On 27 December 2012 22:39, Marc Schwartz <marc_schwartz at me.com> wrote:
>> unique(t(apply(cbind(v1, v2), 1, sort)))

More information about the R-help mailing list