PDHGEQZ User Guide


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 appears 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.

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@inproceedings{Adlerborn2016PDHGEQZUG, title={PDHGEQZ User Guide}, author={Bj{\"{o}rn Adlerborn and Bo K{\aa}gstr{\"{o}m and Daniel Kressner and PDHGEQZ User Guide}, year={2016} }