[R] nls error in formula

[Anaid Diaz]

Hi,
I'm a new R user, with a lot of questions. At the
moment I'm stoped on an error traying to fit a model:

> x <- sandeel ## numeric data (2500-60000)
> y <- Noss   ## numeric data  (0-1.2)
> A <- 0.8
> B <- 0.6
> C <- 1/40000
> nls( y ~ A-B*exp(-C*x))
Error in match.call(definition, call, expand.dots) : 
        .Primitive... is not a function

I'm not sure if the error is due to the formula sytax
or something else.
I'll appreciate any help

Sylvia


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