
From:  Ana Sofia Morais 
Subject:  [igraph] using igraph to calculate PageRank 
Date:  Thu, 2 Jun 2011 18:52:59 +0200 
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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