try lapply(df, class)
Steve E On Thu, Aug 26, 2010 at 4:31 PM, Daniel Brewer <daniel.bre...@icr.ac.uk> wrote: > Hello, > > Is there a simple way to get the class type for each column of a > data.frame? I am in the situation where I would like to get all the > columns of a data.frame that are factors. > > I have tried: > apply(df,2,class) > but all the columns come back as class "character". apply is treating it as a matrix, and so converts it to the lowest common form. try lapply and use is.factor, with some unlist for good measure: z=data.frame(x=1:10,l=factor(1:10)) unlist(lapply(z,is.factor)) x l FALSE TRUE Barry ______________________________________________ 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. ******************************************************************* This email and any attachments are confidential. Any use...{{dropped:8}} ______________________________________________ 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.
