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] <javascript:> > https://lists.nongnu.org/mailman/listinfo/igraph-help >
_______________________________________________ igraph-help mailing list [email protected] https://lists.nongnu.org/mailman/listinfo/igraph-help
