Re: [R] Finding a single unique item in duplicated vectors

From: Charles C. Berry <cberry_at_tajo.ucsd.edu>
Date: Wed 04 Apr 2007 - 17:07:44 GMT

On Wed, 4 Apr 2007, John Kane wrote:

> I have a very simple problem and am completely missing
> the solution.
> I have two character variables (character ID's from
> two datasets) Data set 'b'
> is data set 'a' with one more subject added.
> How do I find out which is the added subject?

         setdiff( b, a ) ??

>
> I have tried duplicated and unique without much
> success. I can find all the
> duplicated ID's but how do I extract the new "unique"
> one?
> Example:
> a <- as.character(Cs(b,d,c,a))
> b <- as.character( Cs(a,b,c,d,e))
> h <- c(a,b) ; h
> h[duplicated(h)]
>
> I just want to extract that "e"!
>
> I had thought that
> h[!duplicated(h)]
> might work but it simply returns all the unique values
> whereas
> I simply want to simply find the odd man out.
>
> I thought of using sorting the vectors & using a cbind
> but the id's are assigned
> more or less randomly so that didn't work.
>
> Thanks
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

Charles C. Berry                        (858) 534-2098
                                          Dept of Family/Preventive Medicine
E mailto:cberry@tajo.ucsd.edu	         UC San Diego
http://biostat.ucsd.edu/~cberry/         La Jolla, San Diego 92093-0901

______________________________________________
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Thu Apr 05 03:11:33 2007

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