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MathGroup Archive 1998

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Re: Tree plotting package?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg13337] Re: [mg13233] Tree plotting package?
  • From: Robert Pratt <rpratt at math.unc.edu>
  • Date: Mon, 20 Jul 1998 02:49:56 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

The Combinatorica standard package has what you want.

Needs["DiscreteMath`Combinatorica`"]

?RootedEmbedding

"RootedEmbedding[g, v] constructs a rooted embedding of graph g with
vertex v as the root."

t=FromUnorderedPairs[{{1,2},{1,3},{3,4},{3,5}}];

ShowLabeledGraph[RootedEmbedding[t,1],{x,y,z,a,b}];

Rob Pratt
Department of Mathematics
The University of North Carolina at Chapel Hill CB# 3250, 331 Phillips
Hall
Chapel Hill, NC  27599-3250

rpratt at math.unc.edu

http://www.math.unc.edu/Grads/rpratt/

On Fri, 17 Jul 1998, Sean Cleary wrote:

> Does anyone know if there is an implementation of a Mathematica package
> to draw nice two-dimensional pictures of trees?  That is, to go from a
> description of a tree as {x,{y,{z,a,b}}} or somesuch to a plot looking
> like
> 
>      x
>     / \
>    y   z
>       / \
>      a   b
> 
> I was not able to find anything in MathSource. It won't be hard to
> write, it just seemed silly to work on if there is already something
> good available.
> 
> Thanks-
> 
> Sean Cleary  Department of Mathematics  Peters Building 359 CSU Fresno
> CA 93740 sean_cleary at csufresno.edu              
> http://zimmer.csufresno.edu/~cleary



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