On Thu, Aug 26, 2010 at 11:31 AM, 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". >
Try this where iris is a builtin data frame with one several numeric columns and one factor column, Species: > onlyFactors <- Filter(is.factor, iris) > str(onlyFactors) 'data.frame': 150 obs. of 1 variable: $ Species: Factor w/ 3 levels "setosa","versicolor",..: 1 1 1 1 1 1 1 1 1 1 ... -- Statistics & Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at 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.
