Tamás Nepusz <ntamas@...> writes:
> > > 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 > > 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. > By any chance, has there been update on this? I have a single connected graph with: decompose.graph(mygraph) [[1]] IGRAPH DN-- 133 3497 -- + attr: name (v/c), Weight (e/n) And I still get issues with ARPACK: page.rank(mygraph) Error in page.rank(mygraph) : At arpack.c:1178 : ARPACK error, The Schur form computed by LAPACK routine dlahqr could not be reordered by LAPACK routine dtrsen. So I do not think it is down to isolated vertices, at least not in my case. Any pointers/hints/tips would be greatly appreciated. Thank you very much _______________________________________________ igraph-help mailing list [email protected] https://lists.nongnu.org/mailman/listinfo/igraph-help
