On Tue, 30 Jun 2020 13:53:10 +0200
Luigi Marongiu <marongiu.lu...@gmail.com> wrote:
> function(a, b, x) {
> y = (a * x^2) / (b^2 + x^2)
> return(y)
> }
Take a look at the examples in ?nls.lm. The first argument of the
function must be the parameter list/vector; the rest of the arguments
are passed from ... in nls.lm call. This is _unlike_ do.call, which can
be used to "unpack" a list of arguments into function arguments.
To make it more concrete, change your function to:
function(par) (par$a * par$x^2) / (par$b^2 + par$x^2)
Then it should work.
--
Best regards,
Ivan
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