Block triangular preconditioners for symmetric saddle-point problems

Authors:
V. Simoncini
Affiliations:
Dipartimento di Matematica, Università di Bologna Piazza di Porta San Donato, 5, I-40127 Bologna, Italy and IMATI- CNR, Pavia, Italy
Venue:
Applied Numerical Mathematics - Numerical algorithms, parallelism and applications
Year:
2004

Citing 13
Cited 11

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Abstract

Five computationally efficient algorithms for block downdating of the least squares solutions are proposed. The algorithms are block versions of Givens rotations strategies and are rich in BLAS-3 operations. They efficiently exploit the triangular structure ...