[erlang-questions] digraph questions

[Richard O'Keefe]

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.

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
>
>
>
>
>
>
>
>
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