how to subtract one string from another in R

Hi:

I think I misread your intentions the first time. Is this more in line
with what you want?

f <- function(s) {
     ssp <- unlist(strsplit(string, ""))
     n <- length(ssp)
     splits <- grep(' ', ssp)
     sapply(splits, function(x) paste(ssp[-(1:x)], collapse = ""))
   }

f(string)

[1] "DEFG HIJKLM NOPQ RSTUV WXY" "HIJKLM NOPQ RSTUV WXY"
[3] "NOPQ RSTUV WXY"             "RSTUV WXY"
[5] "WXY"

The function returns a vector of substrings rather than individual
substrings assigned to separate objects.

HTH,
Dennis

On Sat, Jun 18, 2011 at 1:36 AM, Vijayan Padmanabhan

Dear R Group
Here is what i am trying to do.. but couldnt figure out how..

string<-"ABC DEFG HIJKLM NOPQ RSTUV WXY"
string1<-substr(string,1,4)


I want to create an R object string 2 ( following the logic shown).. R does
not allow string subtraction.. any suggestions how to achieve this?


string2<-string-string1 (it should now hold "DEFG HIJKLM NOPQ RSTUV WXY"

I want to loop this till i reach the end of the original string..

stringn<-"WXY"

Any help would be appreciated.



Regards
Vijayan Padmanabhan

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