[R] Question on list objects

[Gabor Grothendieck]

On Sat, Jan 8, 2011 at 6:26 AM, Ron Michael <ron_michael70 at yahoo.com> wrote:
> Hi, I have 2 questions on list object:
>
> 1. Suppose I have a matrix like:
> dat <- matrix(1:9,3)
>
> Now I want to replicate this entire matrix 3 times and put entire result in a list object. Means, if "res" is the resulting list then I should have:
>
> res[[1]]=dat, res[[2]]=dat, res[[3]]=dat
>
> How can I do that in the easilest manner?
>
> 2. Suppose I have 2 list objects:
> list1 <- list2 <- vector("list", length=2)
> for(i in 1:2) {
>   list1[[i]] <- matrix(rnorm(15), 3)
>   list2[[i]] <- matrix(rnorm(15), 3)
>  }
>
> How can I add these 2 list objects? I have tried with just list1+list2, however it is generating some error.
>

Try these:

rep(list(dat), 3)

Map(`+`, list1, list2)

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