and I was afraid everyone would be on holidays... thanks to all 7 of you who answered !!
David Gouache Arvalis - Institut du Végétal Station de La Minière 78280 Guyancourt Tel: 01.30.12.96.22 / Port: 06.86.08.94.32 -----Message d'origine----- De : Gabor Grothendieck [mailto:[EMAIL PROTECTED] Envoyé : lundi 30 juillet 2007 15:05 À : GOUACHE David Cc : r-help@stat.math.ethz.ch Objet : Re: [R] regular expressions : extracting numbers I assume if you want the "" components to be NA then you really intend the result to be a numeric vector. The following replaces all non-digits with "" (thereby removing them) and then uses as.numeric to convert the result to numeric. Just omit the conversion if you want a character vector result: s <- c("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") as.numeric(gsub("[^[:digit:]]+", "", s)) On 7/30/07, GOUACHE David <[EMAIL PROTECTED]> 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: 06.86.08.94.32 > > ______________________________________________ > 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. > ______________________________________________ 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.
