[R] test if text is part of vector

[R. Michael Weylandt <michael.weylandt@gmail.com>]

You also might look at grepl() if you have time: it allows regular expressions and will be a little (a lot?) more flexible in how you define a match if you want to ignore things like capitalization. 

(mnemonic: the L in grepl indicates its like grep but returns logicals instead of positions)

Michael

On Jan 20, 2012, at 7:42 AM, "Johannes Radinger" <JRadinger at gmx.at> wrote:

> Hi,
> 
> thank you very much... %in% is the operator I was looking for.
> 
> cheers,
> johannes
> 
> -------- Original-Nachricht --------
>> Datum: Fri, 20 Jan 2012 13:01:54 +0100
>> Von: Rainer M Krug <r.m.krug at gmail.com>
>> An: Johannes Radinger <JRadinger at gmx.at>
>> CC: R-help at r-project.org
>> Betreff: Re: [R] test if text is part of vector
> 
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>> On 20/01/12 12:50, Johannes Radinger wrote:
>>> Hello,
>>> 
>>> this is a very simple question: How can I find out if a word is
>>> part of a list of words
>>> 
>>> like: a <- "word1" b <- "word4"
>>> 
>>> vector <- c("word1","word2","word3")
>>> 
>>> I tried it with match(a,vector) but this gives the position of the
>>> word.
>>> 
>>> I am not sure if and how that can be done with a logical operator
>>> like if: IF text is part of vector THEN print "is part"
>>> 
>>> Probably a very easy thing to do, but I am missing the logical
>>> operator... and help(if) is not working
>> 
>> check out %in%
>> 
>> help:
>> 
>> ?"%in%"
>> 
>> Cheers,
>> 
>> Rainer
>> 
>>> 
>>> best regards, johannes
>> 
>> 
>> - -- 
>> Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
>> Biology, UCT), Dipl. Phys. (Germany)
>> 
>> Centre of Excellence for Invasion Biology
>> Stellenbosch University
>> South Africa
>> 
>> Tel :       +33 - (0)9 53 10 27 44
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>> 
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>> 
>> email:      Rainer at krugs.de
>> 
>> Skype:      RMkrug
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