G'day Jose,
On Fri, 29 Oct 2010 11:25:05 +0200
José Manuel Gavilán Ruiz <g...@us.es> wrote:
> Hello, I want to maximize a likelihood function expressed as an
> integral that can not be symbolically evaluated. I expose my problem
> in a reduced form.
>
> g<- function(x){
> integrand<-function(y) {exp(-x^2)*y}
> g<-integrate(integrand,0,1)
> }
> h<-function(x) log((g(x)))
>
> g is an object of the class function, but g(2) is a integrate object,
> I can print(g(2)) an get a result, but
> if I try h(2) R says is a nonnumeric argument for a mathematical
> function. My goal is to maximize h.
Which can be done without R quite trivially.
The result of g(x) is exp(-x^2)/2.
So h(x) is -x^2-log(2), which is maximised at x=0.
Cheers,
Berwin
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