Algorithm 854

Author:

Benner Peter1,Kressner Daniel2

Affiliation:

1. Technische Universität Chemnitz, Chemnitz, FRG

2. University of Zagreb, Zagreb, Croatia

Abstract

This article describes Fortran 77 subroutines for computing eigenvalues and invariant subspaces of Hamiltonian and skew-Hamiltonian matrices. The implemented algorithms are based on orthogonal symplectic decompositions, implying numerical backward stability as well as symmetry preservation for the computed eigenvalues. These algorithms are supplemented with balancing and block algorithms which can lead to considerable accuracy and performance improvements. As a by-product, an efficient implementation for computing symplectic QR decompositions is provided. We demonstrate the usefulness of the subroutines for several, practically relevant examples.

Publisher

Association for Computing Machinery (ACM)

Subject

Applied Mathematics,Software

Reference48 articles.

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4. ON A BLOCK IMPLEMENTATION OF HESSENBERG MULTISHIFT QR ITERATION

5. On swapping diagonal blocks in real Schur form;Bai Z.;Linear Algebra Appl.,1993

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