Re: [igraph] calculate edge weight based on node weight

[Gábor Csárdi]

No, it won't take a long time. This is in fact the fastest solution, both in practice, and also optimal in terms of time complexity. E.g.

g <- graph.ring(10)

V(g)$w <- 1:10

el <- get.edgelist(g, names=FALSE)

E(g)$w <- V(g)$w[el[,1]] * V(g)$w[el[,2]]

plot(g, edge.label=E(g)$w, vertex.label=V(g)$w)

G.

On Thu, May 8, 2014 at 4:57 PM, Wang, Jing <address@hidden> wrote:

Hi Gabor,

Thank you for your response! Indexing the vertex attributes for each edge will take a long time. Do you have any efficient way to index vertex attributes?

Thanks,

Jing

From: Gábor Csárdi <address@hidden>
Reply-To: Help for igraph users <address@hidden>
Date: Thursday, May 8, 2014 at 3:52 PM
To: Help for igraph users <address@hidden>
Subject: Re: [igraph] calculate edge weight based on node weight

Use get.edgelist() and then index your vertex attributes with the two columns it returns. Kinda hacky, but igraph does not really have a good language/syntax for manipulating attributes.

Gabor

On Thu, May 8, 2014 at 4:46 PM, Wang, Jing <address@hidden> wrote:

Dear Sir/Madam,

If I have the node weights for a network and want to calculate the edge weights based on the weights of two nodes in each edge, how can I calculate it?

Thanks,

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