> On 31 Mar 2015, at 20:55 , William Dunlap <wdun...@tibco.com> wrote: > > You can use structure() to attach the names to a list that is input to > data.frame. > E.g., > > dfNames <- c("First", "Second Name") > data.frame(lapply(structure(dfNames, names=dfNames), > function(name)rep(NA_real_, 5))) >
Yes, I cooked up something similar: names <- c("foo","bar","baz") names(names) <- names # confuse 'em.... as.data.frame(lapply(names, function(x) rep(NA_real_,10))) but wouldn't it be more to the point to do df <- as.data.frame(rep(list(rep(NA_real_, 10)),3)) names(df) <- names ? The lapply() approach could be generalized to a vector of column classes, though. A general solution looks impracticable; once you start considering how to specify factor columns with each their own level set, things get a bit out of hand. -pd > > Bill Dunlap > TIBCO Software > wdunlap tibco.com > > On Tue, Mar 31, 2015 at 11:37 AM, Sarah Goslee <sarah.gos...@gmail.com> > wrote: > >> Hi, >> >> Duncan Murdoch suggested: >> >>> The matrix() function has a dimnames argument, so you could do this: >>> >>> names <- c("strat", "id", "pid") >>> data.frame(matrix(NA, nrow=10, ncol=3, dimnames=list(NULL, names))) >> >> That's a definite improvement, thanks. But no way to skip matrix()? It >> just seems unRlike, although since it's only full of NA values there >> are no coercion issues with column types or anything, so it doesn't >> hurt. It's just inelegant. :) >> >> Sarah >> -- >> Sarah Goslee >> http://www.functionaldiversity.org >> >> ______________________________________________ >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >> 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. >> > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. -- Peter Dalgaard, Professor, Center for Statistics, Copenhagen Business School Solbjerg Plads 3, 2000 Frederiksberg, Denmark Phone: (+45)38153501 Email: pd....@cbs.dk Priv: pda...@gmail.com ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.