Message-ID: <4FF48055.1010603@sapo.pt>
Date: 2012-07-04T17:41:41Z
From: Rui Barradas
Subject: About nlminb function
In-Reply-To: <1341419854516-4635421.post@n4.nabble.com>
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 Hern?ndez 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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