Good point. Could you add a comment to FR#295 and perhaps embelish the title to include cbind please.
https://r-forge.r-project.org/tracker/index.php?func=detail&aid=295&group_id=240&atid=978 A reason for not setting the key attribute after cbind may have been speed because attr<- takes a copy of the whole object (it triggers copy-on-write when called within a function). At least, that's what I thought at the time perhaps. We now have an internal function to set attributes by reference, so it's pretty easy to do that now. But, := is much much better if you can. > When I do cbind(DT, DF), where DT has a key, the result loses the key. > cbind can't change ordering though, so why does that happen? I can > understand if you are trying to combine two keyed DT's that the result > is ambiguous, but it isn't in this case. > _______________________________________________ > 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
