[R] string concatenation operator

[Spencer Graves]

      Thanks to both Robert McGehee and Andy Liaw for their informative 
(and quick) replies. 

      Best Wishes,
      spencer graves

McGehee, Robert wrote:

>Not without extending character to another class. If you try to define
>this "+" method using S4, you get a proper error indicating that
>addition over characters is not allowed. 
>
>  
>
>>setMethod("+", signature("character", "character"), 
>>    
>>
>		function(e1,e2) paste(e1,e2, sep = ""))
>
>Error in setMethod("+", signature("vector", "vector"), function(e1, e2)
>paste(e1,  : 
>	The method for function "+" and signature e1="vector",
>e2="vector" is sealed and cannot be re-defined
>
>FYI, your S3 method wouldn't work anyway as the arguments for the +
>operator are e1, e2 not x, y.
>
>-----Original Message-----
>From: Spencer Graves [mailto:spencer.graves at pdf.com] 
>Sent: Thursday, February 24, 2005 3:46 PM
>To: Gabor Grothendieck
>Cc: r-help at stat.math.ethz.ch
>Subject: Re: [R] string concatenation operator
>
>
>      Can we do something to make the following work: 
>
> > "+.character" <- function(x,y) paste(x,y,sep="")
> > "abc"+"def"
>Error in "abc" + "def" : non-numeric argument to binary operator
>
>      Thanks,
>      spencer graves
>
>Gabor Grothendieck wrote:
>
>  
>
>>Harris A. Jaffee <hjaffee <at> jhmi.edu> writes:
>>
>>: Why doesn't R have one, like "." in Perl or juxtaposition in awk?
>>
>>You could define one like this:
>>
>>R> "%+%" <- function(x,y) paste(x,y,sep="")
>>R> "abc" %+% "def"
>>[1] "abcdef"
>>
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