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Re: [igraph] Correlation between eigenvector (evcent) and vertex strengt

From: Gábor Csárdi
Subject: Re: [igraph] Correlation between eigenvector (evcent) and vertex strength (graph.strength)
Date: Tue, 17 Dec 2013 11:05:58 -0500


1. we don't have your data, how can we comment on this? Maybe your
graph is directed and you consider edge directions in one function,
but not in another. Maybe.

2. if you think evcent is wrong or the strength is wrong, please tell
us, and if it is wrong, we'll fix it.

3. I am sure that it is possible to engineer a graph in which strength
and evcent are not very correlated. So maybe you just have such a
graph, and there is nothing to investigate here.

4. the email did not contain any attachments.


On Tue, Dec 17, 2013 at 11:01 AM, Hermann Norpois <address@hidden> wrote:
> Hello,
> maybe I did not understand the concepts of graph.strenght and evcent but my
> guess was that the resultung vectors should be correlated in some way.
> Using graph.strength (g) for an undirected weighted graph I get the strength
> of each vertex. The eigenvector of the adjacency matrix should reflect
> (somehow) the strengh of each vertex as well. But it doesnt (see
> attachment).
> Can you please comment on this. Thanks
> Hermann
> My example:
> evc <- evcent (g)
> ev <- evc$vector
> ch22.long.deg <- graph.strength (g)
> and plotted the results (see attachment).
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