[R] reorder a list

[arun]

You may also try:
library(reshape2)
 A2 <- melt(A1)

split(A2[,2],A2[,1])
A.K.




On Tuesday, July 8, 2014 12:57 PM, Lorenzo Alfieri <alfios17 at hotmail.com> wrote:
Hi,
I'm trying to find a way to reorder the elements of a list.
Let's say I have a list like this:
A1<-list(c(1:4),c(2,4,5),23,c(4,5,13))

> A1
[[1]]
[1] 1 2 3 4

[[2]]
[1] 2 4 5

[[3]]
[1] 23

[[4]]
[1]  4  5 13

All the elements included in it are values, while each sublist is a time index
Now, I'd like to reorder the list (without looping) so to obtain one sublist for each value, which include all the time indices where each value appears.
In other words, the result should look like this:
>A2
[[1]]
[1] 1

[[2]]
[1] 1 2    #because value "2" appears in the time index [[1]] and [[2]] of A1

[[3]]
[1] 1

[[4]]
[1] 1 2 4

[[5]]
[1] 2 4

[[13]]
[1] 4

[[23]]
[1] 3

Any suggestion?
Thanks
Alfio

                          
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