[R] About nlminb function

[Rui Barradas]

Hello,

Try


makeFunction <- function(x) eval( parse(text=x) )

name <- 'hdev'
nlminb(c(9, 12), objective = makeFunction(name))

Hope this helps,

Rui Barradas

Em 04-07-2012 17:37, Freddy Hernández escreveu:
> Hello
>
> I want to use the nlminb function but I have the objective function like
> characters. I can summarize the problem using the first example in the
> nlminb documentation.
>
> x <- rnbinom(100, mu = 10, size = 10)
> hdev <- function(par)   -sum(dnbinom(x, mu = par[1], size = par[2], log =
> TRUE))
> nlminb(c(9, 12), objective=hdev)
>
> With the last instructions we obtain appropriate results. If I have the name
> of the objective function stored in the element name, how can modify the
> next two instructions to obtain the same above results?
>
> name <- 'hdev'
> nlminb(c(9, 12), objective=name)
>
> Thanks for the reply.
>
> Freddy.
>
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