On Wed, Feb 3, 2010 at 12:29 PM, Steve Lianoglou <mailinglist.honey...@gmail.com> wrote: > Hi, > > On Wed, Feb 3, 2010 at 1:19 PM, Peng Yu <pengyu...@gmail.com> wrote: >> 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) > > Does `unlist(root, recursive=FALSE)` get you what you want? > > R> unlist(root, recursive=FALSE) > $main1.sub1 > x y > 1 1 1 > 2 2 2 > 3 3 3 > > $main1.sub2 > u v > 1 7 11 > 2 8 12 > 3 9 13 > > $main2.sub3 > p q > 1 3 6 > 2 4 7 > 3 5 8
My example has only 2 levels. But my questions is not limited to a particular level. The nonrecursive version flatten the first level. But what if the tree is of n level and I want to flatten it to m levels (where m < n)? ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
