Preprint No. MPIMD/15-12

Title: Some remarks on the complex J-symmetric eigenproblem

Author(s): Peter Benner, Heike Faßbender, Chao Yang


Date: 2015-07-21


The eigenproblem for complex J-symmetric matrices is considered. A proof of the existence of a transformation to the complex J-symmetric Schur form proposed in [C. Mehl. On asymptotic convergence of nonsymmetric Jacobi algorithms. SIAM J. Matrix Anal. Appl., 30:291-311, 2008.] is given. The complex symplectic unitary QR decomposition and the complex symplectic SR decomposition are discussed. It is shown that a QR-like method based on the complex symplectic unitary QR decomposition is not feasible here. A complex symplectic SR algorithm is presented which can be implemented such that one step of the SR algorithm can be carried out in O(n) arithmetic operations. Based on this, a complex symplectic Lanczos method can be derived. Moreover, it is discussed how the 2n x 2n complex J-symmetric matrix can be embedded in a 4n x 4n real Hamiltonian matrix.


author = {Peter Benner and Heike Faßbender and Chao Yang},
title = {Some remarks on the complex J-symmetric eigenproblem},
number = {MPIMD/15-12},
month = jul,
year = 2015,
institution = {Max Planck Institute Magdeburg},
type = {Preprint},
note = {Available from \url{}},

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