An Extension of the COCR Method to Solving Shifted Linear Systems with Complex Symmetric Matrices
DOI:
https://doi.org/10.4208/eajam.260410.240510aKeywords:
Shifted linear systems, complex symmetric matrices, COCR, Krylov subspace methods, electronic structure calculation.Abstract
The Conjugate Orthogonal Conjugate Residual (COCR) method [T. Sogabe and S.-L. Zhang, JCAM, 199 (2007), pp. 297-303.] has recently been proposed for solving complex symmetric linear systems. In the present paper, we develop a variant of the COCR method that allows the efficient solution of complex symmetric shifted linear systems. Some numerical examples arising from large-scale electronic structure calculations are presented to illustrate the performance of the variant.