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.
The NAMESPACE for nlme contains the following lines:
export(..., ranef, ...)
S3method(ranef, lme)
ranef is defined as a standard S3 generic,
function (object, ...)
UseMethod("ranef")
<environment: namespace:nlme>
I made up a minimal package, "raneftest" (which is available at
<http://www.math.mcmaster.ca/~bolker/misc/raneftest_0.001.tar.gz>)
that contains a single function, ranef.x(), which is supposed to be an
S3 method for class x ... its (trivial) definition is
ranef.x <- function(object, ...) {
print("x")
}
the package has a NAMESPACE file:
-----------
exportPattern("^[^\\.]")
##importFrom(nlme,ranef)
import(nlme)
----------
(I've tried both import() and importFrom() -- I would prefer to use
importFrom() if I can ... I also tried importMethodsFrom(nlme,ranef) ,
but it fails -- it seems to be intended for S4 and not S3 methods?)
The package also has a tests directory with a single file, which looks
like this:
> library(raneftest)
> x <- 1
> class(x) <- "x"
> ranef.x(x)
[1] "x"
> ranef(x)
Error: could not find function "ranef"
Execution halted
I have read the relevant section of R-exts.pdf several times --
apologies in advance if I am doing something boneheaded.
Does anyone have suggestions for what to try next ... ?
cheers
Ben Bolker
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