Combine the functions with rbind(). If there are more than two, it will probably be easier to define the function outside sapply.
> dta <- sapply(iris[,-5],function(x) rbind(mean(x,na.rm=T), sd(x,na.rm=T))) > rownames(dta) <- c("mean", "SD") > dta Sepal.Length Sepal.Width Petal.Length Petal.Width mean 5.8433333 3.0573333 3.758000 1.1993333 SD 0.8280661 0.4358663 1.765298 0.7622377 ---------------------------------------------- David L Carlson Associate Professor of Anthropology Texas A&M University College Station, TX 77843-4352 > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of Yao He > Sent: Wednesday, December 26, 2012 6:54 PM > To: r-help@r-project.org > Subject: [R] how to apply two or more functions to each columns in a > time? > > Dear All: > > I want to calculate the mean and sd for each column in a data.frame. > > Taking data(iris) for example: > I tried sapply(iris[,-5],mean,na.rm=T) or sapply(iris[,-5],sd,na.rm=T) > to calculate the mean and sd .But sapply() transfer a function per > time. How to transfer two functions in a time to generate a data.frame > like this: > > Sepal.Length Sepal.Width Petal.Length Petal.Width > mean 5.84333 3.05733 3.758000 1.199333 > SD 0.82806 0.43586 1.765298 0.762237 > > > Thanks a lot > > Yao He > > -- > ------------------------- > Master candidate in 2rd year > Department of Animal genetics & breeding > Room 436,College of Animial Science&Technology, > China Agriculture University,Beijing,100193 > E-mail: yao.h.1...@gmail.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.