[R] string concatenate across rows of a matrix??

[Peter Dalgaard BSA]

Tony Plate <tplate at blackmesacapital.com> writes:

>  > apply(format(x2), 1, paste, collapse=" ")
>        1       2       3       4
> "a 1 k" "b 2 l" "c 3 m" "d 4 n"

...or even (data frames only):

> do.call("paste",x2)
[1] "a 1 k" "b 2 l" "c 3 m" "d 4 n"

 
> 
> At 12:45 PM 9/24/2002 -0700, Albert Kim wrote:
> 
> >Is there a simple way to string-concatenate across the rows of a matrix or
> >data.frame into a vector of strings?  perhaps using paste() or
> >something like it?
> >
> >That is, I want to map from something like x2 below:
> >
> >         > x2 <- data.frame(C1 = letters[1:4], C3=1:4, C3=letters[11:14])
> >         > x2
> >           C1 C3 C3
> >         1  a  1  k
> >         2  b  2  l
> >         3  c  3  m
> >         4  d  4  n
> >
> >to something like:
> >
> >         [1]  "a  1  k"
> >         [2]  "b  2  l"
> >         [3]  "c  3  m"
> >         [4]  "d  4  n"
> >
> >Sincerely,
> >Al Kim
> >Research Scientist
> >Department of Psychology
> >University of Washington, Box 351525
> >Seattle, WA. 98195, USA
> >E-Mail:  alkim at u.washington.edu;  Tel: (206)543-2395
> >
> >
> >
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-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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