R help - Apr 2013 - simulation\bootstrap of list factors

Dear R experts,

I am trying to simulate a list containing data matrices. Unfortunately, I
don't manage to get it to work.

A small example:

n=5
nbootstrap=2

  subsets<-list()
  for (i in 1:n){
    subsets[[i]] <-   rnorm(5, mean=80, sd=1)


    for (j in 1:nbootstrap){
      test<-list()
      test[[j]]<-subsets[[i]]
      }
  }

How can I get test to be 2 simulation rounds with each 5 matrices.

Kind regards, Tobias



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Tobias,

I'm not sure if this is what you're after, but perhaps it will help.

# create a list of 5 vectors
n <- 5
subsets <- lapply(1:n, function(x) rnorm(5, mean=80, sd=1))

# create another list that takes 2 bootstrap samples from each of the 5
vectors and puts them in a matrix
nbootstrap <- 2
test <- lapply(subsets, function(x) matrix(sample(x, nbootstrap*length(x),
replace=TRUE), ncol=nbootstrap))

subsets
test

Jean


On Wed, Apr 17, 2013 at 1:09 PM, Berg, Tobias van den
<to.vandenberg@vumc.nl
> wrote:
> Dear R experts,
>
> I am trying to simulate a list containing data matrices. Unfortunately, I
> don't manage to get it to work.
>
> A small example:
>
> n=5
> nbootstrap=2
>
>   subsets<-list()
>   for (i in 1:n){
>     subsets[[i]] <-   rnorm(5, mean=80, sd=1)
>
>
>     for (j in 1:nbootstrap){
>       test<-list()
>       test[[j]]<-subsets[[i]]
>       }
>   }
>
> How can I get test to be 2 simulation rounds with each 5 matrices.
>
> Kind regards, Tobias
>
>
>
>         [[alternative HTML version deleted]]
>
> ______________________________________________
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> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
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