Re: [igraph] calculating all eigenvectors with arpack

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Re: [igraph] calculating all eigenvectors with arpack - failure when NEV

From:	Tamas Nepusz
Subject:	Re: [igraph] calculating all eigenvectors with arpack - failure when NEV=N
Date:	Tue, 04 Jan 2011 11:12:23 +0100
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Which is not possible if nEigen=nDim. Is there some workaround to get all eigenvectors?

I guess the solution is to use another eigensolver, not ARPACK. ARPACK suffers from all sorts of roundoff errors when you use it to find *all* the eigenvectors - after all, it was designed only for finding a few eigenvectors.

--
T.

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