Re: [R] Vectors out of lists?

[Phil Spector]

Eduardo -
   Thanks for the reproducible example!

Y<-list()
Y[[1]]<-function(u) sqrt(u)
Y[[2]]<-function(u) sin(u)
Y[[3]]<-function(u) 1/2*u
Ybar = function(u)mean(sapply(Y,function(fun)fun(u)))

Since integrate requires a function which accepts a vector
and returns a vector, we'd need to use Vectorize() before
trying to integrate:

integrate(Vectorize(Ybar),0,1)

0.4587882 with absolute error < 5.6e-05

                                        - Phil Spector
                                         Statistical Computing Facility
                                         Department of Statistics
                                         UC Berkeley
                                         spec...@stat.berkeley.edu




On Tue, 16 Nov 2010, Eduardo de Oliveira Horta wrote:

Thanks, guys... but it seems these suggestions won't work.

Let me try to be more specific with a simple example:

Y<-list()
Y[[1]]<-function(u) sqrt(u)
Y[[2]]<-function(u) sin(u)
Y[[3]]<-function(u) 1/2*u

I wanted something equivalent to

Ybar<-function(u){
   1/3*(Y[[1]](u) + Y[[2]](u) + Y[[3]](u))
}

but with arbitrary length(Y) and without using any loops. Also, I can't allow
for discretization, since I must be able to evaluate Ybar at any u, as I'm
going to integrate it with the function "integrate".

Thanks again,

Eduardo Horta

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