> 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.
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