Re: [R] spliting strings ...

From: Peter Dalgaard <P.Dalgaard_at_biostat.ku.dk>
Date: Thu, 13 Dec 2007 15:06:27 +0100

Monica Pisica wrote:
> Hi everyone,
>
> I have a vector of strings, each string made up by different number of words. I want to get a new vector which has only the first word of each string in the first vector. I came up with this:
>
> str <- c('aaa bbb', 'cc', 'd eee aa', 'mmm o n')
> str1 <- rep(1, length(str))
> for (i in 1:length(str)) {
> str1[i] <- strsplit(str, " ")[[i]][1]
> }
> str1
> 'aaa' 'cc' 'd' 'mmm'
>
> Now, is there any way to do this simpler?
>
> sapply(strsplit(str, " "), "[", 1)
[1] "aaa" "cc" "d" "mmm"

-- 
   O__  ---- Peter Dalgaard             Ă˜ster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
 (*) \(*) -- University of Copenhagen   Denmark          Ph:  (+45) 35327918
~~~~~~~~~~ - (p.dalgaard_at_biostat.ku.dk)                  FAX: (+45) 35327907

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Received on Thu 13 Dec 2007 - 14:11:03 GMT

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