[R] Recursive function for lists

[John Fox]

Dear Martin,

At 06:34 PM 6/11/2002 +0200, Martin Maechler wrote:

>unlist() is probably what you can't recall.
>It is a bit different than your  flatten()  though :
>
> > lst <- list(lst1=list(a=1:3, b=4:6), lst2=list(c=7:9, d=10:12), e=13:15)
>
> > str(ul <- unlist(lst, recursive=FALSE))
>List of 7
>  $ lst1.a: int [1:3] 1 2 3
>  $ lst1.b: int [1:3] 4 5 6
>  $ lst2.c: int [1:3] 7 8 9
>  $ lst2.d: int [1:3] 10 11 12
>  $ e1    : int 13
>  $ e2    : int 14
>  $ e3    : int 15

I tried unlist, but don't think that it will solve Eric's problem -- look, 
e.g., at how it treats the element $e in the original list.

I rather like Thomas Lumley's solution, which is simpler than mine, though 
I think that it will be necessary to unlist the result returned by his 
treeapply.

Regards,
  John


-----------------------------------------------------
John Fox
Department of Sociology
McMaster University
Hamilton, Ontario, Canada L8S 4M4
email: jfox at mcmaster.ca
phone: 905-525-9140x23604
web: www.socsci.mcmaster.ca/jfox
-----------------------------------------------------

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