[R] Check for presence of object in group of objects

ONKELINX, Thierry Thierry.ONKELINX at inbo.be
Wed Jan 31 11:16:56 CET 2007

You need %in%

"a" %in% x
"d" %in% x


ir. Thierry Onkelinx

Instituut voor natuur- en bosonderzoek / Reseach Institute for Nature and Forest

Cel biometrie, methodologie en kwaliteitszorg / Section biometrics, methodology and quality assurance

Gaverstraat 4

9500 Geraardsbergen


tel. + 32 54/436 185

Thierry.Onkelinx op inbo.be



Do not put your faith in what statistics say until you have carefully considered what they do not say.  ~William W. Watt

A statistical analysis, properly conducted, is a delicate dissection of uncertainties, a surgery of suppositions. ~M.J.Moroney

-----Oorspronkelijk bericht-----
Van: r-help-bounces op stat.math.ethz.ch [mailto:r-help-bounces op stat.math.ethz.ch] Namens Christoph Heibl
Verzonden: woensdag 31 januari 2007 11:01
Aan: r-help op stat.math.ethz.ch
Onderwerp: [R] Check for presence of object in group of objects

Dear List,

must be simple, but i got stuck on this...

I´ve been trying around for some time, but I could not find a  
straigthforward way to do this:
How can one ask if a certain object is element of a certain group of  
objects, e.g stored in a vector?

x <- c("a", "b", "c")
# is there a simple function which returns:
is "a" part of x?
is "d" part of x?

Thanks a lot

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