[R] [igraph] Counting edges for each vertex

Mulone mulone at rome.com
Sat Jun 15 20:00:49 CEST 2013

Hi all,

I'm analysing an e-mail network. I loaded the following information in a
directed igraph:

*Vertex* types: person, e-mail
V(g)[ type == "person" ]
V(g)[ type == "email" ]

*Edge* types: sends, receives
E(g)[ type == "send" ]
E(g)[ type == "receive" ]

So for example:

John --send--> email1 --receive--> Mary
John --send--> email2 --receive--> Mary
Mary --send--> email3 --receive--> John

I would like to generate a summary of the e-mail activity, with edges with
an attribute representing the number of emails:

John --2--> Mary
Mary --1--> John

I tried to do this, but I haven't figured it out yet.
I managed to get in/out edges for each letter, but then I don't know what to
do to hold a count.

      outedges = V(g) [ from(e) ]
      inedges = V(g) [ to(e) ]

I just started using igraph, and I find even basic operations quite
difficult to carry out. :-/
How would I go about to do that?


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