I'd use something like which(df == "b", arr.ind = TRUE)
which, gives the column number in the second spot; this gives you colnames(df)[which(df == "b", arr.ind = TRUE)[2]] Michael On Thu, Feb 2, 2012 at 11:00 AM, ikuzar <raz...@hotmail.fr> wrote: > Sorry, it was not clear: > > my program have to return column name corresponding to a value, for example > 'b' (so, the corresponding column is c1) > How to retrieve c1 ? > Thanks > > -- > View this message in context: > http://r.789695.n4.nabble.com/How-to-retrieve-a-column-name-of-a-data-frame-tp4351764p4351866.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. ______________________________________________ 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.
