• To: mathgroup at smc.vnet.net
• Subject: [mg75391] Re: Re: [mg75381] Suppress Arrowheads (Combinatorica)
• From: Bruce Colletti <vze269bv at verizon.net>
• Date: Sat, 28 Apr 2007 05:53:47 -0400 (EDT)

```Bob

Thanks for the solution.  Have just found another on p210 of the Combinatorica book:

ShowGraph@MakeUndirected@FromOrderedPairs@{{2, 1}, {1, 3}, {3, 2}}

Others may also find this useful.

Bruce

=====================
From: Bob Hanlon <hanlonr at cox.net>
Date: 2007/04/27 Fri AM 05:50:56 CDT
To: Bruce Colletti <vze269bv at verizon.net>, mathgroup at smc.vnet.net
Subject: [mg75391] Re: [mg75381] Suppress Arrowheads (Combinatorica)

Needs["DiscreteMath`Combinatorica`"];

G = FromOrderedPairs[{{2,1},{1,3},{3,2}},
Type->Undirected];

ShowGraph[G];

Bob Hanlon

---- Bruce Colletti <vze269bv at verizon.net> wrote:
> Re Combinatorica found in Mathematica 5.2.
>
> How would I "simply" suppress (hopefully via a ShowGraph option) the arrowheads that ShowGraph displays for a DIRECTED graph?
>
> For instance, let G = FromOrderedPairs@{{2,1},{1,3},{3,2}} (a digraph since Directed appears in the graph object).  ShowGraph@G displays the arrowheads and hoping to suppress these, I instead enter:
>
> ShowGraph[G, EdgeDirection->False]
>
> Unfortunately, the arrowheads still appear.
>
> Although ShowGraph@FromOrderedPairs[{{2,1},{1,3},{3,2}},Type->Undirected] succeeds, I'd rather not tinker with a digraph's Type.  Instead, I wonder if this can be "simply" done via ShowGraph.   Any ideas?
>
> Thanks.
>
> Bruce
>
>

```

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