[R] split strings
ronggui.huang at gmail.com
Tue May 26 15:40:20 CEST 2009
They look like file path, so you can make use of basename() first,
then use gsub to strip the suffix.
 "BE" "CH"
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:
>  "F:/Naval_Live_Oaks/2005/data//BE.tif"
>  "F:/Naval_Live_Oaks/2005/data//CH.tif"
>  "F:/Naval_Live_Oaks/2005/data//CRR.tif"
>  "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?
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> and provide commented, minimal, self-contained, reproducible code.
HUANG Ronggui, Wincent
Dept of Public and Social Administration
City University of Hong Kong
Home page: http://asrr.r-forge.r-project.org/rghuang.html
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