# [R] Arrange a multi-level list to a one-level list

From: Lisa <lisajca_at_gmail.com>
Date: Fri, 27 May 2011 15:04:11 -0700 (PDT)

I just want to arrange a multi-level list to a one-level list. For example:

x <- list(list(matrix(sample(c(0,1), 4, replace = T), 2), matrix(sample(c(2,3), 4, replace = T), 2)), list(matrix(sample(c(0,1), 6, replace = T), 2), matrix(sample(c(2,3), 6, replace = T), 2)))

> x
[[1]]
[[1]][[1]]

[,1] [,2]
[1,] 1 1
[2,] 0 0

[[1]][[2]]

[,1] [,2]
[1,] 3 2
[2,] 3 3

[[2]]
[[2]][[1]]

[,1] [,2] [,3]
[1,] 1 0 0
[2,] 0 1 0

[[2]][[2]]

[,1] [,2] [,3]
[1,] 2 3 3
[2,] 3 3 3

If I do this work one time, I will arrange it like this:

c(x[[1]], x[[2]]) # Only consider the first level of the list.

[[1]]

[,1] [,2]
[1,] 1 1
[2,] 0 0

[[2]]

[,1] [,2]
[1,] 3 2
[2,] 3 3

[[3]]

[,1] [,2] [,3]
[1,] 1 0 0
[2,] 0 1 0

[[4]]

[,1] [,2] [,3]
[1,] 2 3 3
[2,] 3 3 3

But when I repeat this work many times and the levels will change each time in a loop, how can I pass the arguments to c()? For example, in the first iteration, the first level of a list is 3, in the second iteration, the first level of a list is 5? ….

Any help would be greatly appreciated.

Lisa

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