Prof Brian Ripley <[EMAIL PROTECTED]> writes: > 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.
To wit: > d <- data.frame() > names(d) <- character(0) > d[FALSE] NULL data frame with 0 rows > d[NULL] NULL data frame with 0 rows -- O__ ---- Peter Dalgaard Ă˜ster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel