calculate k smallest eigenvalues using LOBPCG

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zsy12
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Joined: Wed Nov 28, 2018 10:05 am

calculate k smallest eigenvalues using LOBPCG

Post by zsy12 » Wed Nov 28, 2018 11:19 am

Dear all,

I want to calculate k smallest eigenvalues of a large sparse matrix (1e6*1e6), and the only solver I can find to finish this task is LOBPCG from MAGMA, which can solve the largest and smallest eigenvalues. However, I couldn't find some certain parameter to determine to solve whether largest or smallest k eigenvalues. Could you please tell me how to set parameters to calculate only k smallest eigenvalues of a large sparse matrix? I know that num_eigenvaluses in solver_par is the k number of EV for eigensovers, but I didn't find documation about sparse precond_par parameters. Is there some parameters that I didn't notice?

Best regards,
Shiyun

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