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?

Thanks for any hint,

        Roberto

-- 
        <r/>
| Roberto Brunelli - [scientist at  Fondazione Bruno Kessler-irst]
|           'Home can be anywhere, for it is a part of one's self'

------------------
ITC -> dall'1 marzo 2007 Fondazione Bruno Kessler
ITC -> since 1 March 2007 Fondazione Bruno Kessler

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