[R] characters in a string
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]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] characters in a string
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$, rha,b,c,drh) [1] TRUE You can pass the entire source vector to grepl(): Vec - c(rha,b,c,drh, 1, 2, 3, 4, a, b, c, drh, rh1, 2, 3, 4rh) grepl(^rh.*rh$, Vec) [1] TRUE FALSE FALSE TRUE HTH, Marc Schwartz __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] characters in a string
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$, x ) f( rha,b,c,drh ) [1] TRUE See ?grepl for details. Romain -- Romain Francois Professional R Enthusiast +33(0) 6 28 91 30 30 http://romainfrancois.blog.free.fr |- http://bit.ly/cCmbgg : Rcpp 0.8.6 |- http://bit.ly/bzoWrs : Rcpp svn revision 2000 `- http://bit.ly/b8VNE2 : Rcpp at LondonR, oct 5th __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] characters in a string
On Sep 15, 2010, at 11:16 AM, raje...@cse.iitm.ac.in wrote: Hi, I need to check if a string rha,b,c,drh is delimited by two rh 's as efficiently as possible(I need to do this a lot of times) and return TRUE. Can someone suggest a good technique? txt - rha,b,c,drh grep(^rh.+rh$, txt) [1] 1 [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. David Winsemius, MD West Hartford, CT __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] characters in a string
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: Hi, I need to check if a string a,b,c,d is delimited by two 's as efficiently as possible(I need to do this a lot of times) and return TRUE. Can someone suggest a good technique? txt - a,b,c,d grep(^.+$, txt) [1] 1 [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. David Winsemius, MD West Hartford, CT [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
