On Mon, 31 Jul 2006, hadley wickham wrote: > Sorry, a better example is: > > > data.frame(a=1)[FALSE] > NULL data frame with 1 rows > > data.frame(a=1)[NULL] > NULL data frame with 1 rows > > vs > > > data.frame()[FALSE] > Warning in is.na(nm) : is.na() applied to non-(list or vector) > NULL data frame with 0 rows > > data.frame()[NULL] > Warning in is.na(nm) : is.na() applied to non-(list or vector) > NULL data frame with 0 rows
It's reasonable: > names(data.frame()) NULL which is a problem as data frames are supposed to have names. So the bug is in data.frame. -- 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
