> OTOH, it's interesting that some methods to "stick some S4 > objects into a data frame do work fine , at least for the > following case (R-script below) -- and I wonder if we (R developers) > shouldn't think about more explicitly supporting this, > e.g., by stating something like > > >> If an S4 object simply *contains* an atomic class that can be > >> used as data.frame column, then that S4 object can also be used > >> as data.frame column > > and trying to fix all cases where the above is not fulfilled.
There are also many cases where using a list as a data.frame column will cause errors, depending on the contents of the list. Hadley ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
