PDHGEQZ user guide
2015 (English)Report (Other academic)
Given a general matrix pair (A,B) with real entries, we provide software routines for computing a generalized Schur decomposition (S, T). The real and complex conjugate pairs of eigenvalues appear as 1×1 and 2×2 blocks, respectively, along the diagonals of (S, T) and can be reordered in any order. Typically, this functionality is used to compute orthogonal bases for a pair of deflating subspaces corresponding to a selected set of eigenvalues. The routines are written in Fortran 90 and targets distributed memory machines.
Place, publisher, year, edition, pages
Umeå: Department of Computing Science, Umeå University , 2015. , 16 p.
Report / UMINF, ISSN 0348-0542 ; 15.12
software, userguide, generalized eigenvalue problem, nonsymmetric QZ algorithm, multishift, bulge chasing, infinite eigenvalues, parallel algorithms, level 3 performance, aggressive early deflation
IdentifiersURN: urn:nbn:se:umu:diva-120008OAI: oai:DiVA.org:umu-120008DiVA: diva2:926165