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positive-definiteness of a huge sparse matrix

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I want to determine the positive-definiteness of a huge sparse matrix (N^2,N^2) with nonzeros on the 9 off-diagnols, where N is the larger the better. I am using eigs(A,1,'SA') because of the memory issues, however, for N=260, each iteraction requires 1 hour. I really want to find out fast method to deal this problem.

Answers (2)

Sean de Wolski
Sean de Wolski on 22 Mar 2012

Andrew Knyazev
Andrew Knyazev on 15 May 2015

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