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--27464147-159404577-1190380210=:1425 Content-Type: TEXT/PLAIN; charset=iso-8859-1; format=flowed Content-Transfer-Encoding: 8BIT Please do read the documentation, which says The 'rbind' data frame method first drops all zero-column and zero-row arguments. So your first data frame has been dropped, and the result is the same as rbind.data.frame(list(a = "foo")) which should give a factor column via promotion of a list to a data frame. On Tue, 18 Sep 2007, [EMAIL PROTECTED] wrote: > Full_Name: Sébastien Villemot > Version: 2.5.1 > OS: Debian GNU/Linux (Testing aka "Lenny") > Submission from: (NULL) (193.51.127.120) > > > Here is the transcript of a R session under version 2.5.1: > >> x <- data.frame(a = I(character(0))) >> typeof(x$a) > [1] "character" >> x <- rbind(x, list(a = "foo")) >> typeof(x$a) > [1] "integer" > > The column "a" has been converted from character to factor. > > This was not happening under version 2.4.0 Patched (2006-11-25 r39997): >> x <- data.frame(a = I(character(0))) >> typeof(x$a) > [1] "character" >> x <- rbind(x, list(a = "foo")) >> typeof(x$a) > [1] "character" > > Furthermore, the bug doesn't show up (in 2.5.1) if the data frame is initially > non-empty: >> x <- data.frame(a = I("bar")) >> typeof(x$a) > [1] "character" >> x <- rbind(x, list(a = "foo")) >> typeof(x$a) > [1] "character" > > Best, > > Sébastien Villemot > > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel > -- 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 --27464147-159404577-1190380210=:1425-- ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel