[R] building packages using S4 methods
Prof Brian Ripley
ripley at stats.ox.ac.uk
Wed Jul 30 13:59:59 CEST 2003
On Wed, 30 Jul 2003, Marsland, John wrote:
> I have been building a package around a sequence of S4 classes which I have
> coded in separate *.R files in the "./R" subdirectory of the package.
> The package builds without error, but when I load it in R I get:
[Incidentally, packages with R syntax errors `build without errors': that
is not a useful test.]
> Error in reconcilePropertiesAndPrototype(name, slots, prototype,
> superClasses) :
> Class "xxxx" extends an undefined class ("yyyyyy"
> I guess R is trying to source the *.R files in the wrong order? Since both
Or perhaps you didn't give them names in the right order? The files are
not in fact source-d, but they are concatenated in alphabetical order and
the concatenated file is parsed and evaluated (at load time unless you
used --save: see below).
`alphabetical order' is potentially locale-dependent, although we try to
ensure that the C locale is used, I don't think this is bound to work on
> classes are defined in the package and work fine at the command prompt.
> Is it just that this has not been an issue before owing to R's lazy
> Is there anything I can do about this... maybe by putting something in the
How are you building the package? Are you using --save? If not, that is
probably the solution as it is highly recommended for packages using S4
Brian D. Ripley, ripley at 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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