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[igraph] using igraph to calculate PageRank

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



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.



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,




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