[R] random binary trees in R

[Steven Finch]

Hello again!

Uwe Ligges' adjustment to my random binary tree recursion
works beautifully.  Now I wish to plot the trees.  Despite a
careful search, I can't find any plotting routine that will work
with my lists.  I've read about "hierarchical clustering" and
"binary dendrograms" in various R packages, but nothing
apparently can take my lists as input.

If anyone has solved this problem and can send me the
relevant code, I will be very thankful!  Please e-mail me
at the below address.  With much appreciation,

Steve Finch
sfinch9 at hotmail.com



>From: Uwe Ligges <ligges at statistik.uni-dortmund.de>
>To: Steven Finch <sfinch9 at hotmail.com>
>CC: r-help at stat.math.ethz.ch
>Subject: Re: [R] random binary trees in R
>Date: Wed, 29 Nov 2006 18:45:18 +0100
>
>
>
>Steven Finch wrote:
>>Hello!
>>
>>I wish to generate random binary trees in R.
>>Unfortunately recursive code like:
>>
>>t <- function(p)
>>   {
>>    list(ifelse(runif(1)<p,t(p),0), ifelse(runif(1)<p,t(p),0))
>>   }
>
>ifelse() is vectorized and evaluates for both cases!
>Instead, try:
>
>t <- function(p)
>   list(if(runif(1) < p) t(p) else 0, if(runif(1) < p) t(p) else 0)
>
>
>Uwe Ligges
>
>
>>does not seem to work. Has anyone ever
>>performed such a simulation?  I would like
>>to see their code.  Maybe this is not feasible
>>in R.  Please e-mail me at the below address
>>(since I am not yet a subscriber to this list).
>>Thank you!
>>
>>Steve Finch
>>sfinch9 at hotmail.com
>>

_________________________________________________________________
All-in-one security and maintenance for your PC.  Get a free 90-day trial!