how to convert a data.frame to tree structure object such as dendrogram

You will have to decide what R data structure is a "tree structure". But
maybe this will get you started:

foo <- data.frame(x=c('A','A','B','B'), y=c('Ab','Ac','Ba','Bd'))
split(foo$y, foo$x)

$A
[1] "Ab" "Ac"

$B
[1] "Ba" "Bd"

I suppose it is at least a little bit tree-like.


--
Don MacQueen

Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550
925-423-1062





On 3/10/13 9:19 PM, "Not To Miss" <not.to.miss at gmail.com> wrote:

I have a data.frame object like:

data.frame(x=c('A','A','B','B'), y=c('Ab','Ac','Ba','Bd'))

 x  y
1 A Ab
2 A Ac
3 B Ba
4 B Bd

how could I create a tree structure object like this:
    |---Ab
A---|
_|   |---Ac
|
|   |---Ba
B---|
    |---Bb

Thanks,
Zech

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