On Thu, 24 Mar 2011, Ben Bolker wrote:
Ben Bolker <bbolker <at> gmail.com> writes:
I have been struggling all day to import a particular function/method
combination (ranef(), which extracts the random effects from a mixed
model fit) from the nlme package into another package ... so far without
success.
Answered my own question, finally.
Apparently an explicit
export(ranef)
is required, even though there is also an
exportPattern("^[^\\.]")
in the NAMESPACE file, which I would have thought would
export 'ranef' along with everything else ... ?
It exports everything excpet dot-namesin the package's namespace.
Imports are not in the namespace per se, but in the import environment
(which is the enclosure of the namespace). Here is the actual code:
for (p in nsInfo$exportPatterns)
exports <- c(ls(env, pattern = p, all.names = TRUE), exports)
So to re-export a function, you need to do so explicitly.
It is consdered good practice not to use exportPattern() (at least,
not for broadly defined patterns) in production code: see the current
'Writing R Extensions'. Otherwise things may change under you (what
nlme exports has changed recently, hence what import(nlme) brings it
has).
--
Brian D. Ripley, rip...@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
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