On Mon, 3 Feb 2003, Liaw, Andy wrote:
From: Martin Maechler [mailto:maechler@stat.math.ethz.ch]
"Giovanni" == Giovanni Petris <GPetris@uark.edu>
on Mon, 3 Feb 2003 08:36:06 -0600 (CST) writes:
Giovanni> Has anybody else experienced something like the
example below?
not recently.
Could it be that your version of the `grid' package (which is
loaded by `lattice') or `lattice' are incompatible (i.e. older
than) to your R version?
After library(lattice), use
.path.package()
to see where it was loaded from.
This brings up (IIRC) a topic that was discussed on R-devel a while ago: Version checks for required packages. Is this feasible? Seems quite worthwhile to me...
It's not feasible. If package A is upgraded and makes package B need an upgrade, there is no way for package B's maintainer to anticipate this. Now one could be conservative and have B require exactly one version of A, but then upgrading A makes B unusable. (The latter is what has happened a few times with ghostscript and gsview/windvi.) I have suggested before that grid be more closely integrated with R, and become a base package. Then grid would only be changed when the R version changes, and the critical incompatibility goes away. Brian
Brian D. Ripley, ripley@stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595