P.S. same problem with eigenvector centrality, slightly different error
Error in evcent(Graph, directed = TRUE) : At arpack.c:1178 : ARPACK error,
Unknown ARPACK error
On Monday, 6 January 2014 16:02:03 UTC+13, Giulio Valentino Dalla Riva
wrote:
>
> Probably is a bit late but... was the ARPACK error solved?
>
> I'm working with R 2.15.3 and the last CRAN version of igraph (0.6.6) and,
> on a small 161 directed graph with 592 links still gives me a
> Error in page.rank(Graph) : At arpack.c:1178 : ARPACK error, The Schur
> form computed by LAPACK routine dlahqr could not be reordered by LAPACK
> routine dtrsen.
>
> The graph is connected. If you want I can send you the graph...
>
> Best wishes,
>
> Giulio
>
> On Saturday, 3 August 2013 07:18:01 UTC+12, Tamás Nepusz wrote:
>>
>> > At arpack.c:1178 : ARPACK error, The Schur form computed by LAPACK
>> routine dlahqr could not be reordered by LAPACK routine dtrsen.
>> Seems to be a long-standing issue with ARPACK and we haven't figured out
>> yet how to solve this; see, e.g.:
>>
>> https://bugs.launchpad.net/igraph/+bug/365817
>> https://github.com/igraph/igraph/issues/385<https://www.google.com/url?q=https%3A%2F%2Fgithub.com%2Figraph%2Figraph%2Fissues%2F385&sa=D&sntz=1&usg=AFQjCNG0oWSBzdIOzYhr5V42GjgH1yuGFA>
>>
>>
>> It seems to occur on relatively sparse graphs and it also seems that
>> removing isolated vertices usually resolves the problem. Also, the issue
>> will probably not come up again if we switch to PRPACK. Can you try
>> removing any isolated vertices in your graph (if any) and try again? If it
>> still fails, send me your graph somehow and I'll investigate.
>>
>> --
>> T.
>>
>>
>> _______________________________________________
>> igraph-help mailing list
>> [email protected]
>> https://lists.nongnu.org/mailman/listinfo/igraph-help
>>
>
_______________________________________________
igraph-help mailing list
[email protected]
https://lists.nongnu.org/mailman/listinfo/igraph-help
