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Re: [igraph] page.rank speed
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From: |
Tamás Nepusz |
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Subject: |
Re: [igraph] page.rank speed |
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Date: |
Fri, 2 Aug 2013 21:18:01 +0200 |
> 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.