Re: [R] getting last 2 charcters of a string, other "text" functions?

2005-10-31 Thread Gabor Grothendieck 
Note that this one can be slightly simplified by using sub instead of gsub
(since you only will have one match anyways) and the $ is not needed
since .* will consume the maximal matching string:

sub(".*(..)", "\\1", mystring)


On 10/31/05, Carlos J. Gil Bellosta <[EMAIL PROTECTED]> wrote:
> gsub(".*(..)$", "\\1", "i only want the last two characters")
>
> This is only a matter of finding the right regular expression. Use Google to
> find a good tutorial on them.
>
> Carlos J. Gil Bellosta
> http://www.datanalytics.com
>
>
> Quoting t c <[EMAIL PROTECTED]>:
>
> > I wish to obtain the right-most n characters of a character string?
> > What is the appropriate function?
> >
> >
> >
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Re: [R] getting last 2 charcters of a string, other "text" functions?

2005-10-31 Thread Earl F. Glynn 
"t c" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> I wish to obtain the right-most n characters of a character string?  What
is the appropriate function?

substr will work:

> x <- c("abcd", "xyz")

> N <- 2
> substr(x, nchar(x)-N+1, nchar(x))
[1] "cd" "yz"

> N <- 3
> substr(x, nchar(x)-N+1, nchar(x))
[1] "bcd" "xyz"

efg

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Re: [R] getting last 2 charcters of a string, other "text" functions?

2005-10-31 Thread Tobias Verbeke 
t c wrote:

>I wish to obtain the right-most n characters of a character string?  What is 
>the appropriate function?
>  
>
You could make one yourself:

rightmostn <- function(x, n){
  res <- substr(x, nchar(x)-n+1, nchar(x))
  return(res)
}
magic <- "hocuspocus"
rightmostn(magic, 5)
[1] "pocus"

HTH,
Tobias

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Re: [R] getting last 2 charcters of a string, other "text" functions?

2005-10-31 Thread Carlos J. Gil Bellosta 
gsub(".*(..)$", "\\1", "i only want the last two characters")

This is only a matter of finding the right regular expression. Use Google to
find a good tutorial on them.

Carlos J. Gil Bellosta
http://www.datanalytics.com


Quoting t c <[EMAIL PROTECTED]>:

> I wish to obtain the right-most n characters of a character string?  
> What is the appropriate function?
>
>
>
> -
>
>   [[alternative HTML version deleted]]
>
> __
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> 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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Re: [R] getting last 2 charcters of a string, other "text" functions?

2005-10-31 Thread Sundar Dorai-Raj 


t c wrote:
> I wish to obtain the right-most n characters of a character string?  What is 
> the appropriate function?
> 

See ?nchar ?substr

k <- 2
x <- "abcdef"
nc <- nchar(x)
substr(x, nc - k + 1, nc)

HTH,

--sundar

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Re: [R] getting last 2 charcters of a string, other "text" functions?

2005-10-31 Thread Chuck Cleland 
?nchar
?substr

rightmost <- function(x, y){substr(x, start=nchar(x) - (y - 1), 
stop=nchar(x))}

 > x <- c("asfef", "qwerty", "yuiop[", "b", "stuff.blah.yech")

 > rightmost(x, 2)
[1] "ef" "ty" "p[" "b"  "ch"

 > rightmost(x, 3)
[1] "fef" "rty" "op[" "b"   "ech"

t c wrote:
> I wish to obtain the right-most n characters of a character string?  What is 
> the appropriate function?
> 
> 
>   
> -
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> 

-- 
Chuck Cleland, Ph.D.
NDRI, Inc.
71 West 23rd Street, 8th floor
New York, NY 10010
tel: (212) 845-4495 (Tu, Th)
tel: (732) 452-1424 (M, W, F)
fax: (917) 438-0894

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[R] getting last 2 charcters of a string, other "text" functions?

2005-10-31 Thread t c 
I wish to obtain the right-most n characters of a character string?  What is 
the appropriate function?



-

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