Matches in SemOpenAlex for { <https://semopenalex.org/work/W1040645823> ?p ?o ?g. }
- W1040645823 abstract "We transform and partition the symmetric indefinite (saddle point) matrices into a block structure with blocks of orders 1 and 2 forming ‘a priori’ pivots. A sparse incomplete block $LD^{-1}L^T$ factorization of such a partitioned matrix is determined. We show that the reconstruction of a matrix from these incomplete factors forms a constraint preconditioner. The incomplete factorization depends on the existence of incomplete Schur complement reductions of symmetric positive definite matrices. Adding a semi-definite diagonal matrix to each of these incomplete Schur complement reductions addresses the existence and stability issues. Conjugate gradient method is applied to the preconditioned system and numerical results are presented for validation. Keywords: saddle point matrices, transformation, incomplete block factorization, precondition conjugate gradient, incomplete Schur complement reduction" @default.
- W1040645823 created "2016-06-24" @default.
- W1040645823 creator A5033548998 @default.
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- W1040645823 date "2015-01-01" @default.
- W1040645823 modified "2023-09-23" @default.
- W1040645823 title "Incomplete block LD^{-1} L^T factorization for constraint preconditioning techniques" @default.
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