On Wed, Feb 2, 2011 at 7:22 PM, Nick Matzke <[email protected]> wrote: > Oh wait, this basically does it: > >> if ("a" %in% attributes(z)$names) > + print(TRUE) > [1] TRUE > > (but there may be a better way)
If z is a list, you can test is.null(z$a) Peter ______________________________________________ [email protected] 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.
