From: Phlip <phlip_cpp@...>
Date: 2002-09-23T21:16:09+09:00
Subject: rgl can't produce disconnected graphs

[posted and mailed to package author]

Rubies:

I downloaded rgl-0.2.1 from http://sourceforge.net/projects/rgl/

Being a rather simple person, I decided to start by producing the simplest 
graph I could possibly make; a graph with no vertices and no edges.

This proved trivial, so I decided to go to the next level: A graph with one 
vertex and no edges:

        dg=RGL::DirectedAdjacencyGraph.new #[1,2 ,2,3 ,2,4, 4,5, 6,4, 1,6]
        dg.add_vertex('yo')
        dg.write_to_graphic_file('jpg')
        system('kview graph.jpg &')

This produces a graph containing a title, and nothing else. There is no 
single vertex. (Graphviz, the back-end for 'write_to_graphic_file', knows 
to produce a single vertex here.)

RGL either has a bug, or its author thinks single vertices are not graphs. 
In the above example, if we uncomment the "[1,2 ,2,3 ..." stuff and take 
out the .new, we get a graph with 6 vertices. But the 7th is missing.

-- 
  Phlip
                http://www.greencheese.org/YaAw
  --  Proud victim of the dreaded boomerang effect  --