Wasn't there once a time when tapply(f,f,sum) (with "f" a vector) returned a vector instead of a 1D array? Then colnames(x) would just give NULL instead of an error. Sorry my memory isn't more precise.
-- David Brahm ([EMAIL PROTECTED])=20 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Prof Brian Ripley Sent: Monday, January 30, 2006 3:45 AM To: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED]; r-devel@stat.math.ethz.ch Subject: Re: [Rd] colnames(tapply(...)) (PR#8539) On Mon, 30 Jan 2006 [EMAIL PROTECTED] wrote: > I would like to bring to your attention the following error message > which didn't appear on previous versions (long time ago?) > > Thanks for all your effort > > Karl > > Version 2.2.1 Patched (2006-01-21 r37153) > > > f <- rep(c(1,2),each=3D5) > > x <- tapply(f,f,sum) > > colnames(x) > Error in dn[[2]] : subscript out of bounds What is inappropriate about this? x is a 1D array, so it does not have column names (or columns). Indeed, the help page says x: a matrix-like R object, with at least two dimensions for 'colnames'. The exact same message appears in 1.6.2, more than three years old (and=20 the earliest version I still have running). If earlier versions did not=20 have an error message, that was probably a bug. --=20 Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
