[R] Problem with na in nls

From: Florent Bresson <f_bresson_at_yahoo.fr>
Date: Wed 19 Oct 2005 - 22:54:37 EST


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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