How to flatten a tree (based on list) to a certain depth?
On Wed, Feb 3, 2010 at 1:47 PM, Bert Gunter <gunter.berton at gene.com> wrote:
-- and you didn't read my reply.
I did. You said to use a loop. I think flatten a tree to a certain level shouldn't be done with a loop. Loop is a way used in the imperative programming style. Flatten is in the functional programming style. I don't think that it is a good idea to mix the two. Also, the flatten a tree to a certain level operation should be extracted to a well defined function for re-usability. Using a loop is a bad idea to enhance re-usability.
-----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 11:40 AM To: r-help at stat.math.ethz.ch Subject: Re: [R] How to flatten a tree (based on list) to a certain depth? 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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