[R] characters in a string

2010-09-15 Thread raje...@cse.iitm.ac.in
Hi, I need to check if a string rha,b,c,drh is delimited by two rh 's as efficiently as possible(I need to do this a lot of times) and return TRUE. Can someone suggest a good technique? [[alternative HTML version deleted]] __

Re: [R] characters in a string

2010-09-15 Thread Marc Schwartz
On Sep 15, 2010, at 10:16 AM, raje...@cse.iitm.ac.in wrote: Hi, I need to check if a string rha,b,c,drh is delimited by two rh 's as efficiently as possible(I need to do this a lot of times) and return TRUE. Can someone suggest a good technique? See ?grep and ?regex grepl(^rh.*rh$,

Re: [R] characters in a string

2010-09-15 Thread Romain Francois
Le 15/09/10 17:16, raje...@cse.iitm.ac.in a écrit : Hi, I need to check if a string rha,b,c,drh is delimited by tworh 's as efficiently as possible(I need to do this a lot of times) and return TRUE. Can someone suggest a good technique? Hi Rajesh, f - function( x ) grepl( ^rh.*rh$, x )

Re: [R] characters in a string

2010-09-15 Thread David Winsemius
On Sep 15, 2010, at 11:16 AM, raje...@cse.iitm.ac.in wrote: Hi, I need to check if a string rha,b,c,drh is delimited by two rh 's as efficiently as possible(I need to do this a lot of times) and return TRUE. Can someone suggest a good technique? txt - rha,b,c,drh grep(^rh.+rh$, txt)

Re: [R] characters in a string

2010-09-15 Thread raje...@cse.iitm.ac.in
great! Thanks - Original Message - From: David Winsemius dwinsem...@comcast.net To: raje...@cse.iitm.ac.in Cc: r-help r-help@r-project.org Sent: Wed, 15 Sep 2010 21:12:27 +0530 (IST) Subject: Re: [R] characters in a string On Sep 15, 2010, at 11:16 AM, raje...@cse.iitm.ac.in wrote