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Re: [igraph] igraph: how to select specific edges

From: Biau David
Subject: Re: [igraph] igraph: how to select specific edges
Date: Sat, 12 Jan 2013 16:35:38 +0000 (GMT)

OK thanks,

but how do you delete the edges from the plot. When I plot(g) after the command delete, it does not remove the edges from the graph

also, I could not find a 'legend' function for igraph. Should we do them 'by hand'?

thanks and sorry for these trivial questions,


David Biau

De : Gábor Csárdi <address@hidden>
À : Biau David <address@hidden>; Help for igraph users <address@hidden>
Envoyé le : Samedi 12 janvier 2013 17h15
Objet : Re: [igraph] igraph: how to select specific edges

On Sat, Jan 12, 2013 at 10:36 AM, Biau David <address@hidden> wrote:
Dear all,

I would like to remove some edges from my network. I would like to remove all edges connecting one specific vertex (e.g., V(g)[type=='a']) to vertices which share a specific characteristic which I have identified (e.g., V(g)[type=='b']) . I haven't found the way to identify these edges.

Any idea?

See ?iterators:

     ‘inc’ takes a vertex sequence as an argument and returns ‘TRUE’
     for edges which have an incident vertex in it.


g <- graph.ring(10)
# Edge sequence:
# [1]   2 --  1
# [10] 10 --  1

delete.edges(g, E(g)[inc(1)])
# IGRAPH U--- 10 8 -- Ring graph
# + attr: name (g/c), mutual (g/x), circular (g/x)

David Biau

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