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UMINF 11.22

PDLAQR1: An improved version of the ScaLAPACK routine PDLAHQR

PDLAQR1 is a modi ed version of ScaLAPACK (version 1.8.0) routine PDLAHQR. In this note we summarize the differences between these routines. Some anomalies in the old routine are identi ed and fixed. We also implement some new features such as aggressive early deflation to improve the performance. The new routine is both faster and more reliable than the old one.

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Entry responsible: Bo Kagstrom

Page Responsible: Frank Drewes
2022-09-30