[R] unique rows

[John Fox]

Dear Dax,

I'll bet that someone comes up with a better approach, but the following
does appear to work:

u <- unique(t(sapply(as.data.frame(t(h)), sort)))

I hope this helps,
 John

--------------------------------
John Fox
Department of Sociology
McMaster University
Hamilton, Ontario
Canada L8S 4M4
905-525-9140x23604
http://socserv.mcmaster.ca/jfox 
-------------------------------- 

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of dax42
> Sent: Saturday, January 29, 2005 7:54 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] unique rows
> 
> Dear list,
> 
> I would like to extract from a matrix all those rows, that are unique.
> By unique, I don't mean the unique that is accomplished by 
> the function unique(), though...
> 
> Consider the following example:
>  > h
>       [,1] [,2]
> [1,]    4    4
> [2,]    1    4
> [3,]    4    1
> 
> Now unique(h) returns exactly the same - because 1 4 and 4 1 
> is not the same for that function.
> What I would like to see, though, are only the first two rows 
> (or the first and the third, it does not matter).
> 
> Does anybody know how to do that?
> Cheers, Dax.
> 
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