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I am trying to write a clustering method for a similarity matrix of a graph and i need a way to compute the smallest ev/ews of a laplacian matrix. I know that the smallest ew is 0 and the corresponding ev is a Nx1 vector of 1s where N is the size of the laplacian.

Thanks,

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What is an ew? eigenwalue? – S. Carnahan♦ Jul 24 2011 at 7:14
EW = Eigenwert, the german word for eigenvalue. – Johannes Hahn Jul 24 2011 at 13:41
google on lanczos. – Chris Godsil Jul 24 2011 at 14:03

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