[R] how to find unique pairs of variables?

[David Winsemius]

On Sep 15, 2011, at 12:27 PM, bby2103 at columbia.edu wrote:

> I have two variables, both numerical. I would like to find the  
> unique values of the pairs, in other words, unique coordinates if I  
> were to plot them.
>
> I also need to know how many pairs there are, but I guess I can use  
> length() if I can somehow isolate the unique pairs first?

?duplicated

dfrm[ !duplicated(dfrm), ]

# Would give the unique pairs.

-- 
David Winsemius, MD
West Hartford, CT