Thanks to Ehud Cohen and William Dunlap for their assistance. Both solutions worked and were helpful.
Dan Daniel Nordlund Bothell, WA USA > -----Original Message----- > From: ehud cohen [mailto:ehudco.l...@gmail.com] > Sent: Friday, December 18, 2009 1:05 PM > To: Daniel Nordlund > Cc: r-help@r-project.org > Subject: Re: [R] how to combine multiple indicator variables in a single > factor > > you can try: > > df$f<-names(df)[apply(df,1,function(x) which(x==1))] > > Ehud > > On Fri, Dec 18, 2009 at 10:48 PM, Daniel Nordlund > <djnordl...@verizon.net> wrote: > > Say I have a dataframe like this: > > > > df <- data.frame(cbind(c(1,0,0,1),c(0,1,0,0),c(0,0,1,0))) > > > > names(df) <- c('a','b','c') > > > > I would like to create a factor in a new column, where the factor values > are taken from the column names, like this: > > > >> df2 > > a b c f > > 1 1 0 0 a > > 2 0 1 0 b > > 3 0 0 1 c > > 4 1 0 0 a > > > > How would I do this? Thanks, > > > > Dan > > > > Daniel Nordlund > > Bothell, WA USA > > > > ______________________________________________ > > 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.
