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Re: [igraph] igraph bug: "directed" argument skipped

From: Tamas Nepusz
Subject: Re: [igraph] igraph bug: "directed" argument skipped
Date: Wed, 10 Jun 2009 14:02:13 +0100
User-agent: Mutt/1.5.17 (2007-11-01)


In short: try g.get_eid(1,0,directed=True).
The long version: Graph.get_eid has an undocumented keyword argument
called "directed", which determines whether get_eid considers edge
directions or not. Up to 0.5.2, the default value of this argument is
False, which is not logical. If you explicitly set it to be True,
get_eid will work as expected. The bug will be fixed in the next


will be fixed in the next version;

On Wed, Jun 10, 2009 at 02:43:07PM +0200, Danilo Tomasoni wrote:
> in a python environment,
> if I made
> g = igraph.Graph(directed=True)
> g.add_vertices(2).add_edges( (0,1) )
> both
> g.get_eid( 0,1 ) #right
> g.get_eid( 1,0 ) #wrong
> works! as the graph is not undirected!
> How can I solve this bug?
> I hope in a quick response because I'm in a hurry..
> Thank you so much,
> Tomasoni Danilo
> -- 
> Lo scienziato non studia la natura perche` e` utile farlo, la studia perche`
> ne trae diletto, e ne trae diletto perche` la natura e` bella. Se non fosse
> bella, non varrebbe la pena di conoscerla, e se non valesse la pena di
> conoscere la natura, la vita non sarebbe degna di essere vissuta.
> -- Henri Poincare`

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