Re: [igraph] pagerank returns inconsistent results

[Ahmed Abdeen Hamed]

Thanks very much for this. This is very helpful!

-Ahmed

On Sun, Dec 14, 2014 at 6:08 PM, Tamas Nepusz <address@hidden> wrote:

Hello,

This is a bug in the pagerank() method of the Vertex object; it seems that it
always returns the PageRank score of the first vertex. I'll fix this ASAP.

However, note that there is usually no point in calculating PageRank for
a single vertex because calculating it for a single vertex would require to
calculate it for the whole graph anyway. So, it is more efficient to do it like
this:

pr = g.pagerank()
for v in g.vs:
    print "{0}, {1}, {2}".format(v["name"], v.degree(), pr[v.index])

T.

On 12/14, Ahmed Abdeen Hamed wrote:
> Hello friends,
>
> I am calling the vertex pagerank function on a graph as follows:
>
> for v in g.vs:
>     print (str(v["name"]) + "," + str(v.degree()) + "," +
> str(v.pagerank()))#
>
>
> carbon,44,0.0211771680628
> offsets,2,0.0211771680628
> weather,10,0.0211771680628
> extremes,10,0.0211771680628
> assessment,6,0.0211771680628
>
> Even though the degrees are different, I get identical PR for each vertex.
> When calling the pagerank on the graph instance, I get more realistic
> results
>
> I call the graph PR as follow:
>
> print g.vs.pagerank()
>
> Not sure what is going on, any idea?
>
> Thanks very much,
>
> -Ahmed

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--
T.