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suchlike
2004 Apr 19
3
How to write an S4 method for sum or a Summary generic
If I have a class Foo, then i can write an S3 method for sum for it:
>setClass("Foo",representation(a="integer"));aFoo=new("Foo",a=c(1:3,NA))
>sum.Foo <- function(x,na.rm){print(x);print(na.rm);sum(x at a,na.rm=na.rm)}
>sum(aFoo)
But how do I write an S4 method for this? All my attempts to do so have
foundered. For example