> * Sam Steingold <f...@tah.bet> [2012-08-30 08:56:17 -0400]: > > Is there a way for an apply-type function to return a data frame? > the closest thing I think of is > > foo <- as.data.frame(t(sapply(...))) > names(foo) <- c(....)
alas, this has a problem of creating a "homogeneous" data frame, i.e., all the columns are numbers or characters, because the function passed to sapply returns c(....) and > c(1,2,"a") [1] "1" "2" "a" e.g., as.data.frame(t(sapply(c("a,1","b,2","c,3"),function (n) strsplit(n,",")[[1]]))) V1 V2 a,1 a 1 b,2 b 2 c,3 c 3 'data.frame': 3 obs. of 2 variables: $ V1: Factor w/ 3 levels "a","b","c": 1 2 3 ..- attr(*, "names")= chr "a,1" "b,2" "c,3" $ V2: Factor w/ 3 levels "1","2","3": 1 2 3 ..- attr(*, "names")= chr "a,1" "b,2" "c,3" I wanted the V1 column to be a string, and V2 to be a number. (I know stringsAsFactors=FALSE would replace factors with strings, but I need a string and a number) I could, of course, do ret$V2 <- as.numeric(ret$V2) but this would mean a double conversion: from number to string first (by c()) and then back. thanks. -- Sam Steingold (http://sds.podval.org/) on Ubuntu 12.04 (precise) X 11.0.11103000 http://www.childpsy.net/ http://mideasttruth.com http://truepeace.org http://openvotingconsortium.org http://ffii.org http://www.memritv.org Diplomacy is the art of saying "nice doggy" until you can find a nice rock. ______________________________________________ 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.