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...; unresolved Execution halted The unloadNamespace has effectively unloaded a symbol from a completely different shared object. Can anybody shed any light on this problem? Thanks. ----- Mike Firth Senior Technical Specialist AstraZeneca Pharmaceuticals Mereside Alderley Park Macclesfield Cheshire SK10 3LT Tel: 01625 513919

...; unresolved Execution halted The unloadNamespace has effectively unloaded a symbol from a completely different shared object. Can anybody shed any light on this problem? Thanks. ----- Mike Firth Senior Technical Specialist AstraZeneca Pharmaceuticals Mereside Alderley Park Macclesfield Cheshire SK10 3LT Tel: 01625 513919

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