José Mas
Polytechnic University of Valencia
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Publication
Featured researches published by José Mas.
SIAM Journal on Scientific Computing | 2003
Rafael Bru; Juana Cerdán; José Marín; José Mas
Let Ax=b be a large, sparse, nonsymmetric system of linear equations. A new sparse approximate inverse preconditioning technique for such a class of systems is proposed. We show how the matrix A0-1 - A-1, where A0 is a nonsingular matrix whose inverse is known or easy to compute, can be factorized in the form
Linear Algebra and its Applications | 1996
José Mas; Violeta Migall^'on; José Penadés; Daniel B. Szyld
U\Omega V^T
SIAM Journal on Matrix Analysis and Applications | 1995
Rafael Bru; Cristina Corral; Angeles Martinez; José Mas
using the Sherman--Morrison formula. When this factorization process is done incompletely, an approximate factorization may be obtained and used as a preconditioner for Krylov iterative methods. For A0=sIn, where In is the identity matrix and s is a positive scalar, the existence of the preconditioner for M-matrices is proved. In addition, some numerical experiments obtained for a representative set of matrices are presented. Results show that our approach is comparable with other existing approximate inverse techniques.
SIAM Journal on Matrix Analysis and Applications | 2010
Rafael Bru; José Marín; José Mas; Miroslav Tu ring; ma
Abstract Relaxed nonstationary multisplitting methods are studied for the parallel solution of nonsingular linear systems. Convergence results of the synchronous and asynchronous versions for systems with H -matrices are presented. Computational results of these methods on a shared memory multiprocessor vector computer are reported. These results show that nonstationary methods (synchronous and asynchronous) are better than the standard ones, especially when the matrix of the linear system has a relatively small bandwidth. Moreover, asynchronous versions always behave better than the synchronous ones.
SIAM Journal on Scientific Computing | 2014
Rafael Bru; José Marín; José Mas; Miroslav Tůma
Let
Computers & Mathematics With Applications | 2002
Rafael Bru; D. Genstar; José Marín; G. Verdú; José Mas; Thomas A. Manteuffel
Ax=b
Numerical Linear Algebra With Applications | 2009
Rafael Bru; Cristina Corral; Isabel Giménez; José Mas
be a linear system where
SIAM Journal on Matrix Analysis and Applications | 1994
Rafael Bru; José Mas; Ana M. Urbano
A
Applied Mathematics Letters | 1995
Rafael Bru; Cristina Corral; José Mas
is a symmetric positive definite matrix. Preconditioners for the conjugate gradient method based on multisplittings obtained by incomplete Choleski factorizations of
parallel computing | 1999
Cristina Corral; Isabel Giménez; José Marín; José Mas
A