Given a variable aa in the workspace, some of its attributes are:

> typeof(aa)
[1] "list"
> mode(aa)
[1] "list"
> length(aa)
[1] 2

How do I retrieve the maximum indices, in this case 2,3,4? The variable itself is:

> aa
[[1]]
[[1]][[1]]
[[1]][[1]][[1]]
[1] 37531.52

[[1]][[1]][[2]]
[1] 62787.32

[[1]][[1]][[3]]
[1] 5503.184

[[1]][[1]][[4]]
[1] 33832.8


[[1]][[2]]
[[1]][[2]][[1]]
[1] 20469.6

[[1]][[2]][[2]]
[1] 27057.27

[[1]][[2]][[3]]
[1] 51160.25

[[1]][[2]][[4]]
[1] 45165.24


[[1]][[3]]
[[1]][[3]][[1]]
[1] 957.932

[[1]][[3]][[2]]
[1] 21902.94

[[1]][[3]][[3]]
[1] 37531.52

[[1]][[3]][[4]]
[1] 62787.32



[[2]]
[[2]][[1]]
[[2]][[1]][[1]]
[1] 5503.184

[[2]][[1]][[2]]
[1] 33832.8

[[2]][[1]][[3]]
[1] 20469.6

[[2]][[1]][[4]]
[1] 27057.27


[[2]][[2]]
[[2]][[2]][[1]]
[1] 51160.25

[[2]][[2]][[2]]
[1] 45165.24

[[2]][[2]][[3]]
[1] 957.932

[[2]][[2]][[4]]
[1] 21902.94


[[2]][[3]]
[[2]][[3]][[1]]
[1] 37531.52

[[2]][[3]][[2]]
[1] 62787.32

[[2]][[3]][[3]]
[1] 5503.184

[[2]][[3]][[4]]
[1] 33832.8
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