On 03/15/2012 09:51 AM, Alexander wrote:
Hi Martin,
thanks for your quick answer. I didn't know that '.' could be missleading.
Is there any standard way to name function for S4 objects? "get","set"
etc..?
Hi Alexander -- it's usually better to include the original email in the
reply, to provide context especially for those joining the thread later.
I think 'get' and 'set' are implicit in the action of the 'getter'
fun(x) and 'setter' fun(x) <- value function. I would have written (I
wouldn't have used par, which is an existing function unrelated to what
you're trying to do).
setGeneric("parent",
function(object, ...) standardGeneric("parent'))
setMethod("parent", "Father", function(object, ...) object@name)
setGeneric("parent<-",
function(object, ..., value) standardGeneric("parent<-"))
setReplaceMethod("parent", c("Father", "Son1"),
function(object, ..., value) {
object@name <- value
object
})
and used as
parent(obj)
parent(obj) <- son
I realize I'm confused about Father / Son and 'parent' here, maybe you
meant something else by 'par'.
I saw your example, and I was wondering, why get.par(ext) put out "Son1",
and not the same as get.par(new("Son1", name="Son1", par=3))
the setIs established a relationship between Extension and Father; you
could have established a relationship between Extension and Son1
setIs("Extension", "Son1", <...>)
and then you would get your expected result. I have to say that I have
rarely used setIs, so the complexity of inheritance may hold some
surprises, e.g., when there are setIs defined, from Extension to Father,
Son1, and Son2.
Martin
If I define a function just like setMethod("get.par", "Father",
function(object) object@name) , for example
setMethod("get.par", "Father", function(object) object@par)
then it would work, for all objects, which are either Son1 or Son2, but not
all object, which are "Father", contains also the variable par
get.par(new("Father"))
Alexander
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