On 03/13/2012 04:34 AM, Alexander wrote:
Hi,
I am working on a project, which contains S4 classes and subclasses. Lets
assume the following organisation:
A: S4 Class
B,C: inherit from A
D,E,F,G: inherit from B
H,I: inherit from C
I want to define now a generic function, which returns me the name of the
class. I can now write the function with "A" in the signature. Is there any
?class for this function
reason to write the function for B,C, D,E,... with "B","C","D","E", .. in
the signature ? I can imagine that it can become a mess if for example I
Implement the method at the lowest (highest?) level in the hierarchy as
possible -- so on "A" only for the example of class.
write a function for "A" and a special function for "I" (lets assume, I is
the only exception).
If 'I' is somehow special then write a method for it alone
setClass("A"); setClass("C", "A"); setClass("I", "C")
setGeneric("cls", function(x, ...) standardGeneric("cls"))
setMethod(cls, "A", function(x, ...) as.vector(class(x)))
setMethod(cls, "I", function(x, ...) tolower(as.vector(class(x))))
and then
> cls(new("C"))
[1] "C"
> cls(new("I"))
[1] "i"
Have you any best-work-pratice to share ?
Keep your class hierarchy simple and relevant to your actual problem.
Martin
Thanks
Alexander
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