Folks,
My object oriented background is in Java and C++. I am a novice to using
S4/object-oriented coding in R but not to R. Below is an example that I found
that I have expanded on.
I am not getting how "prototype" and "initialize" work together, if at all.
Here is output from a short "session"
> setClass("xx",
+ representation(a="numeric", b ="numeric"),
+ prototype(a=33, b = 333)
+ )
[1] "xx"
>
> #setMethod("initialize", "xx", function(.Object){.Object})
>
> setMethod("initialize", "xx",
+ function(.Object, b) {
+ .Object@b<-b
+ .Object@a<-b^2
+ .Object
+ }
+ )
[1] "initialize"
>
> new("xx", 3)
An object of class "xx"
Slot "a":
[1] 9
Slot "b":
[1] 3
>
> new("xx")
Error in .local(.Object, ...) : argument "b" is missing, with no default
Any help you can provide would be greatly appreciated,
Thanks,
KW
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