[R] splitting a character field in R

[Dimitris Rizopoulos]

try the following:

A <- c("dgabcrt", "fgrtabc", "sabcuuu")
B <- strsplit(A, "abc")

x1 <- sapply(B, "[", 1); x1[is.na(x1)] <- ""
x2 <- sapply(B, "[", 2); x2[is.na(x2)] <- ""
x1
x2

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://www.med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm



----- Original Message ----- 
From: <ManuelPerera-Chang at fmc-ag.com>
To: <jholtman at gmail.com>
Cc: <r-help at stat.math.ethz.ch>
Sent: Friday, October 28, 2005 4:38 PM
Subject: Re: [R] splitting a character field in R


>
>
>
>
> Hi Jim,
>
> Thanks for your post, I was aware of strsplit, but really could not 
> find
> out how i could use it.
>
> I tried like in your example ...
>
> A<-c(1,2,3)
> B<-c("dgabcrt","fgrtabc","sabcuuu")
> C<-strsplit(B,"abc")
>> C
> [[1]]
> [1] "dg" "rt"
>
> [[2]]
> [1] "fgrt"
>
> [[3]]
> [1] "s"   "uuu"
>
> Which looks promissing, but here C is a list with three elements. 
> But how
> to create the two vectors I need from here, that is
>
> ("dg","fgrt", "s") and ("rt","","uuu")
>
> (or how to get access to the substrings "rt" or "uuu").
>
> Greetings
>
> Manuel
>
>
>
>
>                      jim holtman
>                      <jholtman at gmail.c        To: 
> "ManuelPerera-Chang at fmc-ag.com" <ManuelPerera-Chang at fmc-ag.com>
>                      om>                      cc: 
> r-help at stat.math.ethz.ch
>                                               Subject:  Re: [R] 
> splitting a character field in R
>                      28.10.2005 16:00
>
>
>
>
>
>
>> x <- 'dfabcxy'
>> strsplit(x, 'abc')
> [[1]]
> [1] "df" "xy"
>
>
>>
>
>
>
>
> On 10/28/05, ManuelPerera-Chang at fmc-ag.com 
> <ManuelPerera-Chang at fmc-ag.com >
> wrote:
>
>
>
>
>      Dear R users,
>
>      I have a dataframe with one character field, and I would like 
> to
>      create two
>      new fields (columns) in my dataset, by spliting the existing
>      character
>      field into two using an existing substring.
>
>      ... something that in SAS I could solve e.g. combining 
> substr(which I
>      am
>      aware exist in R) and "index" for determining the position of 
> the
>      pattern
>      within the string.
>      e.g. if my dataframe is ...
>      A     B
>      1     dgabcrt
>      2     fgrtabc
>      3     sabcuuu
>
>      Then by splitting by substring "abc" I would get ...
>
>      A     B           B1    B2
>      1     dgabcrt     dg    rt
>      2     fgrtabc     fgrt
>      3     sabcuuu     s     uuu
>
>      Do you know how to do this basic string(dataframe) manipulation 
> in R
>
>      Saludos,
>
>      Manuel
>
>      ______________________________________________
>      R-help at 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
>
>
>
> --
> Jim Holtman
> Cincinnati, OH
> +1 513 247 0281
>
> What the problem you are trying to solve?
>
> ______________________________________________
> R-help at 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
> 


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