| InternalMethods {base} | R Documentation |
Many R-internal functions are generic and allow methods to be written for.
The following primitive and internal functions are generic,
i.e., you can write methods for them:
[,
[[,
$,
[<-,
[[<-,
$<-,
length,
length<-,
dimnames,
dimnames<-,
dim,
dim<-,
names,
names<-,
levels<-,
c,
unlist,
cbind,
rbind,
as.character,
as.complex,
as.double,
as.integer,
as.logical,
as.raw,
as.vector,
is.array,
is.matrix,
is.na,
is.nan,
is.numeric,
rep and
seq.int
(which dispatches methods for "seq").
In addition, is.name is a synonym for is.symbol and
dispatches methods for the latter.
Note that all of the group generic functions are also internal/primitive and allow methods to be written for them.
.S3PrimitiveGenerics is a character vector listing the
primitives which are internal generic and not group generic.
Currently as.vector, cbind,
rbind and unlist are the internal
non-primitive functions which are internally generic.
For efficiency, internal dispatch only occurs on objects, that
is those for which is.object returns true.
methods for the methods which are available.