Roberto Brunelli wrote:
> I'm using an S4 object with a slot of type 'call': I would like to be able to
> initialize
> it with something like NULL or NA (indicating that there is no information in
> the slot)
> but the value should comply with the fact that it must be of type call.
>
> Is there any simple way to obtain this?
This looks fine:
> setClass("testCall", representation = representation(call = "call"))
[1] "testCall"
> test <- new("testCall")
>
> test
An object of class "testCall"
Slot "call":
`<undef>`()
Although, I found a bug while playing around:
cl <- call("round", 10.5)
cl[] <- NULL
cl
## CRASH using R-2.5.0 on Windows XP
Uwe Ligges
> Thanks for any hint,
>
> Roberto
>
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