This bug was reported to r-devel by Martin Morgan on 13th May 2008 (original email pasted below). However I couldn't locate it in the bug tracker (with searches for row, col, as\.factor) It is still present in today's svn version (rev 47115). I hope I'm doing something useful by bringing it up again. I have not sent this to r-bugs, as I'm concerned that not locating it in the bug tracker could be my failing.
Dan original report: ------------------------------------------------------------------ col(matrix(0, 5, 5), as.factor=TRUE) fails > col(matrix(0, 5, 5), as.factor=TRUE) Error in factor(.Internal(col(dim(x))), labels = colnames(x)) : invalid labels; length 0 should be 1 or 5 when the matrix has no dimnames. This is not as advertised. I would have expected the equivalent of factor(.Internal(col(dim(x))), labels=colnames(x, do.NULL=FALSE, prefix="")) > sessionInfo() R version 2.8.0 Under development (unstable) (2008-05-13 r45682) x86_64-unknown-linux-gnu Martin -- Martin Morgan Computational Biology / Fred Hutchinson Cancer Research Center 1100 Fairview Ave. N. PO Box 19024 Seattle, WA 98109 Location: Arnold Building M2 B169 Phone: (206) 667-2793 ------------------------------------------------------------------ -- http://www.stats.ox.ac.uk/~davison ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel