You have not specified a nonlinear formula. There are no parameters to
estimate in the formula you provide, y1~dist. What is the nonlinear
relation you are trying to fit? Look at the help file for nls to see some
examples worked.
?nls
Jean
Gyanendra Pokharel <gyanendra.pokha...@gmail.com> wrote on 10/01/2012
10:27:23 AM:
>
> Hi all,
> I got following problem in fitting the data.
> Any kind of suggestions are welcome
>
>
> > beta <- 3.5
> > d <- seq(0.1,62.5,0.1)
> > y <- exp(-beta*d)
> > y1 <- y
> > x <- read.table("epidist.txt", header = TRUE)
> > data.nls <- as.data.frame(cbind(y1,x))
> > #attach(data.nls)
> > nls.fit <- nls(y1~dist,data.nls)
> Error in cll[[1L]] : object of type 'symbol' is not subsettable
>
>
> Best
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