maybe you should keep your NA but deal with the "na.action" option of the
nls() function ?

HTH.
Florence.


On 10/19/05, Florent Bresson <f_bresson@yahoo.fr> wrote:
>
> I'm trying to run a nls on a subset of a data.frame.
> In the subset, one observation is NA. So I drop the
> observation but when I ask for :
>
> >sm <- nls(machin$revcum ~
> Lc.singh(machin$popcum,p), start=list(p=c(2,3)))
>
> I get :
>
> Erreur dans parse(file, n, text, prompt) : syntax
> error in "~ "
>
> If I put some value for the non available observation
> instead of droping it, it works. So what's the problem ?
>
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