[erlang-questions] digraph questions

[Richard O'Keefe]

I appreciate that these graphs get dense.
That is precisely why I mentioned Gephi and UbiGraph: three dimensional
layout.
Ubigraph in particular is good at making dynamic 3D layouts;
if anyone knows a more actively maintained equivalent I would love to hear
of it.

There's a fair bit of work going on in systems biology.
The C. elegans connectome (wormwiring.org), for example,
has many thousands of edges.  So visualising rather large
networks is a hot topic.


On Tue, 9 Apr 2019 at 20:52, Hugo Mills <hugo@REDACTED> wrote:

> On Tue, Apr 09, 2019 at 12:46:21PM +1200, Richard O'Keefe wrote:
> > The obvious way to visualise a graph would be to drive
> > something like GraphViz or Gephi or, ideally, UbiGraph
> > (https://github.com/alan86alves/ubigraph_server has a
> > copy of the Linux x86-64 version; the official source
> > is currently unreachable).  There is an erlubi. But
> > perhaps the thing you might want to look at first is
> > https://github.com/aol/erlgraph
> > It will take a bit of patching to get up to date with
> > current versions of Erlang and Cowboy.
>
>    These kinds of graphs get *very* dense, and it's almost impossible
> to draw the whole graph in any meaningful sense. You can't just throw
> the graph at a graph drawing package and expect to get usable output.
>
>    You really need to spend the time on working out what it is you
> want to show, whether it's "everything directly relating to this one
> character", or "the sequence of events in this scene", or "who was
> with who over the course of the story", and then strip out everything
> else to show the graph. You're going to be spending much more of your
> time thinking about *what* to show than how to show it, in my
> experience.
>
>    Hugo.
>
> > On Tue, 9 Apr 2019 at 11:29, <lloyd@REDACTED> wrote:
> >
> > > The Erlang digraph library looks like it may provide an interesting
> way to
> > > diagram scenes in a novel.
> > >
> > >
> > >
> > > 1> Scene10 = digraph:new().
> > >
> > >
> > >
> > > Imagine:
> > >
> > >
> > >
> > > Setting:"park"
> > >
> > > Character1:"Franco"
> > >
> > > Character2:"Sophia"
> > >
> > >
> > >
> > > 2> digraph:add_vertex(Scene10, "Park", "Night").
> > >
> > > 3> digraph:add_vertex(Scene10, "Franco", "Old and fat").
> > >
> > > 4> digraph:add_vertex(Scene10, "Sophia", "Young and beautiful").
> > >
> > > 5> digraph:add_edge(Scene10, "Franco", "Sophia", "loves").
> > >
> > >
> > >
> > > OK to here EXCEPT command 5 returns:
> > >
> > >
> > >
> > > ['$e'|0]
> > >
> > >
> > >
> > > 6> digraph:add_edge(Scene10, "Sophia", "Franco", "hates").
> > >
> > >
> > >
> > > OK to here EXCEPT command 5 returns:
> > >
> > >
> > >
> > > ['$e'|0]
> > >
> > >
> > >
> > > 6> digraph:add_edge(Scene10, "Sophia", "Franco", "hates").
> > >
> > > ['$e'|1]
> > >
> > >
> > >
> > > Wah!
> > >
> > >
> > >
> > > Question 1: How do I see labels?
> > >
> > >
> > >
> > > Question 2: Be cool to add a sequence of actions. I can probably figure
> > > this out, but is there an elegant solution?
> > >
> > >
> > >
> > > Question 3: I'd love to visualize the graph. I see it can be done in
> > > Elixir. But I don't know Elixir. Has anyone programmed a way to
> visualize
> > > digraphs in Erlang?
> > >
> > >
> > >
> > > Comment: Digraph is crying out for a comprehensive tutorial. I'd love
> to
> > > do it, but just don't know enough yet.
> > >
> > >
> > >
> > > Many thanks,
> > >
> > >
> > >
> > > LRP
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > _______________________________________________
> > > erlang-questions mailing list
> > > erlang-questions@REDACTED
> > > http://erlang.org/mailman/listinfo/erlang-questions
> > >
>
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>
>
> --
> Hugo Mills             | Books are superior to radio: the soundtrack is
> hugo@REDACTED carfax.org.uk | better
> http://carfax.org.uk/  |
> PGP: E2AB1DE4          |
>
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