On Thu, Nov 11, 2010 at 1:19 PM, William Dunlap <wdunlap at tibco.com> wrote: > Peter, > > Your example doesn't work for me unless I > set options(stringsAsFactors=TRUE) first. Yes, you need to set options(stringsAsFactors=FALSE) (note the FALSE). I do it always so I forgot about that, sorry.