Re: [R] spliting strings ...
Hi Monica,
Try
sapply(as.list(str),function(x) unlist(strsplit(x,"
"))[1])
--- Monica Pisica <[EMAIL PROTECTED]> 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?
>
> Thanks,
>
> Monica
>
>
_
> Get the power of Windows + Web with the new Windows
> Live.
>
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>
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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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Re: [R] spliting strings ... THANKS!
Folks,
Thanks a lot for a very speady answer. I usually read the list quite a bit
because sometimes others put questions i may be interested in. One obs. i made
was that lots of neat tricks can be made with apply, sapply and tapply. But
even if i read all the help on these functions , and they seem obvious, i
recognize that i don't understand them fully, and consequently i avoid them. Is
there any detailed doc. that explains these functions?
Monica> Date: Thu, 13 Dec 2007 15:06:27 +0100> From: [EMAIL PROTECTED]> To:
[EMAIL PROTECTED]> CC: [EMAIL PROTECTED]> Subject: Re: [R] spliting strings
...> > 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 Øster Farimagsgade 5, Entr.B> c/ /'_ ---
Dept. of Biostatistics PO Box 2099, 1014 Cph. K> (*) \(*) -- University of
Copenhagen Denmark Ph: (+45) 35327918> ~~ - ([EMAIL PROTECTED]) FAX:
(+45) 35327907> >
_
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Re: [R] spliting strings ...
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
>
> _
> Get the power of Windows + Web with the new Windows Live.
>
> [[alternative HTML version deleted]]
>
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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.
PLEASE do!
--
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Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
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Re: [R] spliting strings ...
Good afternoon Monica,
Relying on regular expressions, substituting nothing "" for everything
starting with a space until the end of the "line" (i.e. with a dollar sign)
str1 <- sub(" .*$", "", str)
Regards,
Sean
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?
>
> Thanks,
>
> Monica
>
> _
> Get the power of Windows + Web with the new Windows Live.
>
> [[alternative HTML version deleted]]
>
> __
> R-help@r-project.org 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.
>
>
--
View this message in context:
http://www.nabble.com/spliting-strings-...-tp14316255p14316361.html
Sent from the R help mailing list archive at Nabble.com.
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Re: [R] spliting strings ...
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 Øster Farimagsgade 5, Entr.B
c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907
__
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Re: [R] spliting strings ...
one way is the following:
str <- c('aaa bbb', 'cc', 'd eee aa', 'mmm o n')
sapply(strsplit(str, " "), "[", 1)
I hope it helps.
Best,
Dimitris
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
http://www.student.kuleuven.be/~m0390867/dimitris.htm
- Original Message -
From: "Monica Pisica" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, December 13, 2007 2:41 PM
Subject: [R] spliting strings ...
>
> 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?
>
> Thanks,
>
> Monica
>
> _
> Get the power of Windows + Web with the new Windows Live.
>
> [[alternative HTML version deleted]]
>
> __
> R-help@r-project.org 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.
>
Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
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Re: [R] spliting strings ...
Hi,
if you only want the first word, then this should do the trick :
R> sub( " +.*", "", str )
[1] "aaa" "cc" "d" "mmm"
Cheers,
Romain
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?
>
> Thanks,
>
> Monica
>
> _
> Get the power of Windows + Web with the new Windows Live.
>
> [[alternative HTML version deleted]]
>
> __
> R-help@r-project.org 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.
>
>
--
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[R] spliting strings ...
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?
Thanks,
Monica
_
Get the power of Windows + Web with the new Windows Live.
[[alternative HTML version deleted]]
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and provide commented, minimal, self-contained, reproducible code.
