>>>>> "Ernesto" == Ernesto Jardim <ernesto at
ipimar.pt>
>>>>> on 07 Nov 2002 15:43:02 +0000 writes:
Ernesto> I want to use save methods but I found that the
Ernesto> save function is not a generic function ...
Ernesto> If I define
Ernesto> save <- function(x, ...)
Ernesto> UseMethod("save")
Ernesto> I'll be overwriting the original save function ...
Ernesto> Is there another way of doing this ? or am I
Ernesto> understanding it wrong ?
``As always'' you find the answer to this question in the
"R Extensions" / "Writing R Extensions (including C &
Fortran)"
manual. Look for the section ``Adding new generics''.
Yes, please read that in the full context (you'll learn things
that you should rather learn now than later).
But for the sake of .., the crucial excerpt is
RExt> Sometimes package writers want to make generic a function in the
base
RExt> package, and request a change in R. This may be justifiable, but
RExt> making a function generic with the old definition as the default
method
RExt> does have a small performance cost. It is never necessary, as a
package
RExt> can take over a function in the base package and make it generic by
RExt>
RExt> foo <- function(object, ...) UseMethod("foo")
RExt> foo.default <- get("foo", pos = NULL, mode =
"function")
Martin Maechler <maechler at stat.math.ethz.ch>
http://stat.ethz.ch/~maechler/
Seminar fuer Statistik, ETH-Zentrum LEO C16 Leonhardstr. 27
ETH (Federal Inst. Technology) 8092 Zurich SWITZERLAND
phone: x-41-1-632-3408 fax: ...-1228 <><
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