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First N eigenvectors

From: Keith Goodman
Subject: First N eigenvectors
Date: Tue, 21 Sep 2004 09:36:40 -0700

I need to find the first few eigenvectors (the ones with the largest
eigenvalues) of a large matrix.

The function eig works but it is slow because the matrix is large and
because I need to repeat the process hundreds of times.

Does anyone have a function that finds the first N eigenvectors of a
real symmetric matrix--sort of like Matlab's eigs function?

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