Re: [igraph] Still having issues with weighted betweenness calculations using igraph in 64-bit windows

[Gábor Csárdi]

On Wed, May 16, 2012 at 3:21 PM, Alex Upton <address@hidden> wrote:
> Dear all,
>
> I was kindly provided with a windows package for igraph 0.6, thank you Gábor 
> Csárdi, to calculate the weighted betweenness centrality, however I am 
> getting the error message:
>
> Error in betweenness(g1, weights = TRUE) :
> At centrality.c:1454 : Weight vector length does not match, Invalid value

I sense some confusion here. You need to pass the actual weight vector
to the betweenness function:

betweenness(g1, weights=myweights)

or add weights as an edge attribute:

E(g1)$weight <- myweights
betweenness(g1)

Gabor

> I entered some of the code in the function manually: weights <- 
> E(graph)$weight
>
> to check what the variable weights called is and the length, and it is:
>
> length(weights)
> [1] 31996000
>
> Which is the same as:
>
> ecount(g1)
> [1] 31996000
>
> I previously read that this error was due to the weights vector length not 
> being equal to the number of edges in the graph, however this would not seem 
> to be the case, using the code:  , which is contained within the betweenness 
> function. I am calling the function as such:
>
> wb1 <- betweenness(g1, weights = TRUE)
>
> which I believe is the correct way. I am a little confused now as to why 
> there is an error, could anyone help me with this?
>
>
> Regards
>
> Alex
>
> ___________________________________________________________________
>
>
>
> Alex Upton, BEng, MRes, PG Cert Business Administration
> PhD Researcher Biomedical Informatics, Signals and Systems
> School of Electronic, Electrical and Computer Engineering,
> College of Engineering and Physical Sciences, University of Birmingham
> Edgbaston, Birmingham, B15 2TT, United Kingdom
>
> Fax: +44 121 4144291 (school general office)
> Email: address@hidden
>
> Personal Web: http://postgrad.eee.bham.ac.uk/uptona/
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-- 
Gabor Csardi <address@hidden>     MTA KFKI RMKI