No problem at all, this is what the list is for. Fixed now in v1.8.1 :
o base::unname(DT) now works again, as needed by plyr::melt(). Thanks to Christoph Jaeckel for reporting. Test added. On Sat, 2012-03-31 at 15:33 +0200, Christoph Jäckel wrote: > Hi together, > > > I'm really sorry for bothering again and please let me know if I > should just raise bug reports, but I understand far too less about R > and data.table to know whether or not the error messages I stumble > across are due to deliberate changes in v1.8.0 or just minor bugs that > were introduced by that version. > > > Here is another one that I discovered while running old code that > melted (plyr-package) a data.table. In that melt-function, unname() is > called, which does not work anymore with v1.8.0: > > > library(data.table) > DT <- data.table(A = rep(letters[1:10], each=5), > B = rep(1:10, times=5), > C = rnorm(50)) > unname(DT) > > > Error message: > > > > Error in setnames(x, value) : > Can't assign 0 names to a 3 column data.table > > > > > Checking out the source of unname, it's the following row that causes > the problems: > > > > > names(DT) <- NULL > > > > > > So I guess it's the old issue with the copying of data.tables, which > is why data.table introduced setnames(). Just out of curiosity: How > can one fix that? Apparently, unname is a base-R function that uses > names(DT), but data.tables do not like that? So what can one do? Can > one overload such base-R functions? > > > > > Anyways, I hope that minimal example helps. Again, if I should raise a > bug report, just let me know. > > > Christoph > > > _______________________________________________ > datatable-help mailing list > [email protected] > https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help _______________________________________________ datatable-help mailing list [email protected] https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/datatable-help
