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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Computing 54 (1995), S. 167-183 
    ISSN: 1436-5057
    Keywords: 65F10 ; Approximate inverse matrix techniques ; explicit preconditioners ; parallel iterative methods ; unsymmetric finite element systems ; initial/boundary-value problems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Es wird eine Methode zur Approximation der verallgemeinerten inversen Matrix (GAIM) diskutiert, die auf dem Konzept der schwachbesetzten LU-Faktorisierung basiert und explizite Inverse großer schwachbesetzter unsymmetrischer Matrizen auf irregulären Strukturen approximiert, ohne die Zerlegungsfaktoren zu invertieren. In Verbindung mit Modifikationen der GAIM-Technik werden explizite Präkonditionierungsmethoden zur numerischen Lösung von Anfangsrandwertproblemen auf Multiprozessorsystemen vorgestellt. Anwendungen der neuen Methoden auf lineare Randwertaufgaben werden diskutiert und numerische Resultate präsentiert.
    Notes: Abstract A class of Generalized Approximate Inverse Matrix (GAIM) techniques, based on the concept of LU-sparse factorization procedures, is introduced for computing explicitly approximate inverses of large sparse unsymmetric matrices of irregular structure, without inverting the decomposition factors. Explicit preconditioned iterative methods, in conjunction with modified forms of the GAIM techniques, are presented for solving numerically initial/boundary value problems on multiprocessor systems. Application of the new methods on linear boundary-value problems is discussed and numerical results are given.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Communications in Numerical Methods in Engineering 12 (1996), S. 21-29 
    ISSN: 1069-8299
    Keywords: finite element systems ; elliptic partial differential equations ; approximate LU factorization ; explicit matrix inversion ; preconditioning ; Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A new class of explicit generalized approximate inverse finite element matrix algorithmic methods, based on the concept of LU-sparse factorization procedures, without inverting the decomposition factors, has recently been introduced. The large sparse unsymmetric coefficient matrix of irregular structure is factorized approximately and, in conjunction with approximate inverse matrix techniques, yields explicit preconditioned methods for the finite element (FE) and finite difference (FD) method. The numerical implementation of these algorithms is presented and Fortran subroutines for the efficient solution of the sparse unsymmetric linear systems are given.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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