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Sou-Cheng Choi

2013-12-05
13:30:00 - 14:20:00

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Most existing Krylov subspace algorithms for linear systems assume non-singularity of the matrices or linear operators. MINRES-QLP (Choi, Paige, and Saunders 2011) is a MINRES-like algorithm but designed for computing the unique minimum-length and minimum-residual solutions of singular symmetric or Hermitian problems using efficient short-recurrent solution updates and stopping conditions. On nonsingular systems, MINRES-QLP is more stable than MINRES (Paige and Saunders 1975). In this talk we present a common framework that evolves similarly stable and effective algorithms for solving complex-symmetric, skew symmetric, and skew Hermitian linear systems or least-square problems.