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