R help - Jan 2007 - 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?
TRUE
is "d" part of x?
FALSE

Thanks a lot
Christoph

Christoph Heibl wrote:
> 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?
> TRUE
> is "d" part of x?
> FALSE
x <- c("a", "b", "c")

"a" %in% x
[1] TRUE

"d" %in% x
[1] FALSE

?is.element
> Thanks a lot
> Christoph
> 
> ______________________________________________
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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.
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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

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Belgium

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Thierry.Onkelinx op inbo.be

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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?
TRUE
is "d" part of x?
FALSE

Thanks a lot
Christoph

______________________________________________
R-help op 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.