Re: [igraph] using igraph to calculate PageRank

[Tamas Nepusz]

Hello Ana,

Thanks for the bug report, I'm investigating it right now. You can follow
the progress of the issue here:

https://bugs.launchpad.net/igraph/+bug/792352

-- 
Tamas

On 06/02/2011 06:52 PM, Ana Sofia Morais wrote:
> Hello,
> 
>  
> 
> I am having problems using igraph in order to calculate the weighted form of
> PageRank for the nodes in a weighted graph. Here is the code I am using.
> 
>  
> 
> library(igraph)
> 
> m <-
> matrix(c(0,0,0,0,0,4,0,0,0,0,0,0,0,0,5,0,0,0,5,0,0,0,0,0,0,0,0,0,4,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,4,0,0,4,0,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,4,4,0,0,0,0,0,0,0),
> nrow=9, ncol=9)
> 
> tm <- t(m)
> 
> net = graph.adjacency(tm, mode="directed", weighted=TRUE)
> 
> prt = page.rank (net, directed = TRUE, damping = 0.85, weights = NULL)$ vector
> 
>  
> 
> R returns the following error message:
> 
>  
> 
> Error in page.rank(net, directed = TRUE, damping = 0.85, weights = NULL) :
> 
>   At arpack.c:586 : ARPACK error, Unknown ARPACK error
> 
>  
> 
> However, this problem does not occur when matrix  /m/ is not transposed.
> 
>  
> 
> I would be thankful for any suggestions on how to solve this problem.
> 
>  
> 
> With best wishes,
> 
>  
> 
> Sofia
> 
>  
> 
> 
> 
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