thank you, but I m importing data from a txt file and I have a matrix of n*1 The function str seems to work only from 1*n
Wacek Kusnierczyk wrote: > > calpeda wrote: >> hi >> I ve a list of item x = ( "xxxxx1" >> "xxxxx2" >> "yyyyx3") >> >> I need to extract a new vector y = ( "xxxx", >> "xxxx", >> "yyyy" >> ) >> I mean, for each item I need to extract the first 4 digit >> How is that possible? >> > > sub('^(\\d{4}).*', '\\1', x, perl=TRUE) > > vQ > > ______________________________________________ > 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. > > -- View this message in context: http://www.nabble.com/list-substring-tp22826435p22827874.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.