R help - Oct 2013 - convert list of lists to simple list

Dear R Community,

I have the following Problem. I use foreach nested loops, which then return
a list of lists. E.g.:

[[1]]
[[1]][[1]]
Output
[[1]][[2]]
Output
[[1]][[3]]
Output
[[2]]
[[2]][[1]]
Output
....

What I want to achieve is a single layer list, i.e. a list in which
[[1]][[1]] becomes [[1]], [[1]][[2]] becomes [[2]],...,[[2]][[1]] becomes
[[4]] and so on.

Here a reproducible example:

test <- foreach(i = 1:3) %:%
              foreach (j = 1:3) %do% {
                 paste(i,j,sep=",")
              }

In my real problem I have up to 5-6 layers. Anyone an idea?

Thanks!

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On 10 Oct 2013, at 13:17, ivan <i.petzev at gmail.com> wrote:
> test <- foreach(i = 1:3) %:%
>              foreach (j = 1:3) %do% {
>                 paste(i,j,sep=",")
>              }
Not easily reproducible, unless you write

#install.packages("foreach")
require(foreach)

in front of your code.

Here is a starting point:

unlist(test, recursive = FALSE)

? but you would probably need to build a recursive call of the function down to
the last 'list level'. unlist(recursive = TRUE) goes one level too far.
Best,

Philippe Grosjean