On Thu, 13 Dec 2007, Monica Pisica wrote:
>
> Hi everyone,
>
> I have a vector of strings, each string made up by different number of
> words.
You need to define 'word' and 'first'. Your solution says the first word
of " aa" is "", which is not what most people would think.
> 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"
or
> sub("([^ ]+).*", "\\1", str)
I don't see how you got your answer: R does not print like that (and never
has).
>
> Thanks,
>
> Monica
>
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PLEASE do!
--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
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