Here it is using strapply in gsubfn. x is the input, followed by the regular expression which is just New York followed by a parenthesized string of digits. The parenthesized portion is passed to the function, as.numeric, and then everything is simplified using c (otherwise we would get a list as in similar R core functions such as strsplit).
> strapply(x, "New York(\\d+)", as.numeric, simplify = c) [1] 722 20 On Sat, Feb 27, 2010 at 12:25 PM, Greg Snow <greg.s...@imail.org> wrote: > Look at the gsubfn package, it gives more options and will probably make what > you are trying to do easier. > > -- > Gregory (Greg) L. Snow Ph.D. > Statistical Data Center > Intermountain Healthcare > greg.s...@imail.org > 801.408.8111 > > >> -----Original Message----- >> From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- >> project.org] On Behalf Of kayj >> Sent: Friday, February 26, 2010 11:27 AM >> To: r-help@r-project.org >> Subject: [R] using grep >> >> >> Hi All, >> >> I have a character vector with naems of cities in the us. I need to >> extract >> the number that appear after the word "New York", for example, >> >> x<-c("P Los Angeles44AZ", "P New York722AZ", "K New York20") >> >> I want the results to be >> >> 722, 20 >> >> >> cab I use the grep function, if so how? >> I appreciate your help, thanks, >> >> -- >> View this message in context: http://n4.nabble.com/using-grep- >> tp1571102p1571102.html >> Sent from the R help mailing list archive at Nabble.com. >> >> ______________________________________________ >> 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. > > ______________________________________________ > 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. > ______________________________________________ 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.
