[R] How to flatten a tree (based on list) to a certain depth?

[Peng Yu]

On Wed, Feb 3, 2010 at 12:26 PM, Bert Gunter <gunter.berton at gene.com> wrote:
> RTFM (?unlist -- the "recursive" parameter)
> and do it with a loop however many times you like.

How do you know that I didn't read the manual? I didn't quite get my
question. Please see my response to Steve.

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
> Behalf Of Peng Yu
> Sent: Wednesday, February 03, 2010 10:20 AM
> To: r-help at stat.math.ethz.ch
> Subject: [R] How to flatten a tree (based on list) to a certain depth?
>
> Suppose that I have the following list of lists of frames 'root'
> (let's call it a 'tree' of frames). I want to flatten it to be a list
> of frames. However, if I unlist(root), it will flatten the frames as
> well. Is there a simply way to flatten the tree to certain depth?
>
> aframe1=data.frame(x=1:3,y=1:3)
> aframe2=data.frame(u=7:9,v=11:13)
> aframe3=data.frame(p=3:5,q=6:8)
>
> main1=list(sub1=aframe1, sub2=aframe2)
> main2=list(sub3=aframe3)
>
> root=list(main1=main1, main2=main2)
>
> str(root)
> unlist(root)
>
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