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Re: [igraph] eigenvector centrality with second eigenvalue
From: |
Tamás Nepusz |
Subject: |
Re: [igraph] eigenvector centrality with second eigenvalue |
Date: |
Tue, 27 May 2014 22:11:57 +0200 |
> Thanks a lot for your answer. There is (at least) one thing I don't
> understand with arpack: what does "XX" mean in the "which attribute" ?
That's a placeholder. In ARPACK, the "which" component of the options data
structure tells ARPACK what to compute; e.g., "LA" means largest algebraic
eigenvalues. (See ?arpack for more details). This part is automatically set by
the igraph routine that uses ARPACK (e.g., page.rank always uses "LM"), so the
value you see here does not have any particular meaning at all.
T.