OK thanks everybody.

At least I should have try to use terms.formula().
But this is interesting.

2005/8/16, Prof Brian Ripley <ripley@stats.ox.ac.uk>:
> 
> On Tue, 16 Aug 2005, Gavin Simpson wrote:
> 
> > I still can't find this documented for a formula (I found
> > update.formula, but the meaning of "." is different there, slightly, as
> > you indicate) - but it must be as I didn't imagine seeing it - or maybe
> > I did...
> 
> It _is_ in `An Introduction to R', both for lm() and update.formula().
> Since this meaning does depend on using terms.formula(), it is on that
> functions' help page.
> 
> --
> Brian D. Ripley, ripley@stats.ox.ac.uk
> Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
> University of Oxford, Tel: +44 1865 272861 (self)
> 1 South Parks Road, +44 1865 272866 (PA)
> Oxford OX1 3TG, UK Fax: +44 1865 272595
> 
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