[R] How to create an array of lists of multiple components?

[jim holtman]

Is this what you want:

> n1 <- 2
> n2 <- 4
> n3 <- 5
> res <- array(rep(list(list(NULL,NULL,NULL)), n1*n2*n3), dim = c(n1,n2,n3))
> res[1,1,1] # is not a list with three components...
[[1]]
[[1]][[1]]
NULL

[[1]][[2]]
NULL

[[1]][[3]]
NULL


> str(res)
List of 40
 $ :List of 3
  ..$ : NULL
  ..$ : NULL
  ..$ : NULL
 $ :List of 3
  ..$ : NULL
  ..$ : NULL
  ..$ : NULL
 $ :List of 3
  ..$ : NULL
  ..$ : NULL
  ..$ : NULL
 $ :List of 3
  ..$ : NULL
  ..$ : NULL
  ..$ : NULL
 $ :List of 3
  ..$ : NULL
  ..$ : NULL
  ..$ : NULL


On Wed, Dec 29, 2010 at 3:25 PM, Marius Hofert <m_hofert at web.de> wrote:
> Hi,
>
> how can I create an array of lists of three components?
> This approach does not work:
>
> n1 <- 2
> n2 <- 4
> n3 <- 5
> res <- array(rep(vector("list",3), n1*n2*n3), dim = c(n1,n2,n3))
> res[1,1,1] # is not a list with three components...
>
> The goal is that res[1,1,1] is a list with three components. Also, appending the
> components didn't work. For example, I tried:
> component <- list(a = 4, b = "some text", c = 1)
> for(i in 1:3) res[1,1,1] <- c(res[1,1,1], component[[i]])
>
> Cheers,
>
> Marius
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>



-- 
Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?