split strings
They look like file path, so you can make use of basename() first, then use gsub to strip the suffix.
x<-c("F:/Naval_Live_Oaks/2005/data//BE.tif","F:/Naval_Live_Oaks/2005/data//CH.tif")
x2<-sapply(x,basename,USE.NAMES=FALSE)
gsub("[.].{1,}$","",x2)
[1] "BE" "CH" Ronggui 2009/5/26 Monica Pisica <pisicandru at hotmail.com>:
Hi everybody, I have a vector of characters and i would like to extract certain parts. My vector is named metr_list: [1] "F:/Naval_Live_Oaks/2005/data//BE.tif" [2] "F:/Naval_Live_Oaks/2005/data//CH.tif" [3] "F:/Naval_Live_Oaks/2005/data//CRR.tif" [4] "F:/Naval_Live_Oaks/2005/data//HOME.tif" And i would like to extract BE, CH, CRR, and HOME in a different vector named "names.id" for example. I read the help files for sub and grep and the likes but i have to recognize that i did not understand it. So i've done this (which does the job but extremely clumsy): b <- strsplit(metr_list, "//") b <- unlist(b) d <- strsplit(b, "\\.") d <- unlist(d) names.id <- d[c(2, 5, 8, 11)] Can anybody show what would be the proper way to achieve this with some explanations? Thanks, Monica
_________________________________________________________________ Hotmail? goes with you. ial_Mobile1_052009 ______________________________________________ R-help at 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.
HUANG Ronggui, Wincent PhD Candidate Dept of Public and Social Administration City University of Hong Kong Home page: http://asrr.r-forge.r-project.org/rghuang.html