Bonjour David, What about one of these :
R> gsub( "[^[:digit:]]", "", x ) or using perl regular expressions: R> gsub( "\\D", "", x, perl = T ) Cheers, Romain GOUACHE David wrote: > Hello all, > > I have a vector of character strings, in which I have letters, numbers, and > symbols. What I wish to do is obtain a vector of the same length with just > the numbers. > A quick example - > > extract of the original vector : > "lema, rb 2%" "rb 2%" "rb 3%" "rb 4%" "rb 3%" "rb 2%,mineuse" "rb" "rb" "rb > 12" "rb" "rj 30%" "rb" "rb" "rb 25%" "rb" "rb" "rb" "rj, rb" > > and the type of thing I wish to end up with : > "2" "2" "3" "4" "3" "2" "" "" "12" "" "30" "" "" "25" "" "" "" "" > > or, instead of "", NA would be acceptable (actually it would almost be better > for me) > > Anyways, I've been battling with gsub() and things of the sort, but I'm > drowning in the regular expressions, despite a few hours of looking at Perl > tutorials... > So if anyone can help me out, it would be greatly appreciated!! > > In advance, thanks very much. > > David Gouache > Arvalis - Institut du Végétal > Station de La Minière > 78280 Guyancourt > Tel: 01.30.12.96.22 / Port: 06.86.08.94.3 -- Mango Solutions data analysis that delivers Tel: +44(0) 1249 467 467 Fax: +44(0) 1249 467 468 Mob: +44(0) 7813 526 123 ______________________________________________ R-help@stat.math.ethz.ch 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.