[R] Error messages

[Lorenz Gygax]

Dear all,

The following works with a simple result of lm but gives the error with a
more complicated one (could this be due to singularities that occurr in
the model?).

> cooks.distance (X)
Error: NAs in foreign function call (arg 6)
> class (X)
[1] "lm"

But, actually, I would like to ask a more general question: Is there a
place (I searched in the CRAN site) where I find information on what the
error means? It seems to tell me pretty exactly where the problem lies
(foreign function call arg6) but I don't understand it. 

Thanks for any hint. Regards,
--			~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Lorenz Gygax		 LGygax at amath.unizh.ch;       room: 36-L-40
			 Department of Applied Mathematics
			 University of Zuerich-Irchel
			 Winterthurerstr. 190; CH-8057 Zurich
			 voice: 41-1-635-58-52  fax: 41-1-635-57-05
			~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~


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