[R] Finding a single unique item in duplicated vectors
Charles C. Berry
cberry at tajo.ucsd.edu
Wed Apr 4 19:07:44 CEST 2007
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"
> a <- as.character(Cs(b,d,c,a))
> b <- as.character( Cs(a,b,c,d,e))
> h <- c(a,b) ; h
> I just want to extract that "e"!
> I had thought that
> might work but it simply returns all the unique values
> 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.
> R-help at stat.math.ethz.ch mailing list
> 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 at tajo.ucsd.edu UC San Diego
http://biostat.ucsd.edu/~cberry/ La Jolla, San Diego 92093-0901
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