Re: [igraph] Strange pagerank values

[Tamás Nepusz]

Hi,

You are right, the PageRank values should all be between 0 and 1. Your graph 
seems to be a corner case for which the ARPACK solver fail to converge, 
although I have no idea why. I will evaluate and get back to you.

-- 
T.

On 19 Mar 2013, at 01:22, Krishna Sandeep Reddy Dubba <address@hidden> wrote:

> Hi all,
> I am trying to compute pagerank for a graph and I am getting strange values 
> for pagerank. to my knowledge, the page rank values should be between 0 and 1 
> but i get very large or very small number (> 1 and < 0). I attach the .gml 
> file and here is the output. Please let me know what I am doing wrong or is 
> this graph some strange special case?
> 
> In [4]: import igraph
> In [5]: g = igraph.read(f)
> In [6]: pr = g.pagerank()
> In [7]: pr
> Out[7]: 
> [1323658113126271.8,
> -264731622625256.4,
> -264731622625256.44,
> -264731622625256.44,
> 264731622625252.84,
> -264731622625256.4,
> 264731622625252.94,
> -264731622625256.44,
> -264731622625254.56,
> 264731622625252.78,
> -1588389735751520.0,
> 4500437584629358.5,
> -264731622625254.47,
> -264731622625254.53,
> -264731622625254.5,
> 264731622625252.8,
> -264731622625256.4,
> -264731622625256.47,
> -529463245250509.7,
> 264731622625253.78,
> -264731622625256.34,
> -264731622625256.34,
> -264731622625256.4,
> -264731622625256.44,
> -264731622625256.47,
> -264731622625256.4,
> -264731622625256.44,
> -264731622625256.44]
> 
> Thanks,
> dksr
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