@Article{CSIAM-AM-1-463, author = {Ruihao and Huang and and 9144 and and Ruihao Huang and Jiguang and Sun and and 9145 and and Jiguang Sun and Chao and Yang and and 9146 and and Chao Yang}, title = {A Multilevel Spectral Indicator Method for Eigenvalues of Large Non-Hermitian Matrices}, journal = {CSIAM Transactions on Applied Mathematics}, year = {2020}, volume = {1}, number = {3}, pages = {463--477}, abstract = {

Recently a novel family of eigensolvers, called spectral indicator methods (SIMs), was proposed. Given a region on the complex plane, SIMs first compute an indicator by the spectral projection. The indicator is used to test if the region contains eigenvalue(s). Then the region containing eigenvalues(s) is subdivided and tested. The procedure is repeated until the eigenvalues are identified within a specified precision. In this paper, using Cayley transformation and Krylov subspaces, a memory efficient multilevel eigensolver is proposed. The method uses less memory compared with the early versions of SIMs and is particularly suitable to compute many eigenvalues of large sparse (non-Hermitian) matrices. Several examples are presented for demonstration.

}, issn = {2708-0579}, doi = {https://doi.org/10.4208/csiam-am.2020-0021}, url = {http://global-sci.org/intro/article_detail/csiam-am/18303.html} }