نتایج جستجو برای: global gmres algorithm

تعداد نتایج: 1160153  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه شهید باهنر کرمان - پژوهشکده ریاضی ماهان 1393

در این پایان نامه، انواع روش های gmres برای حل دستگاه معادلات خطی نامتقارن تنک بزرگ بررسی می شوند. در ابتدا، بعد از بیان تعاریف و قضایای مورد نیاز ، روش gmres و روش wz-gmres برای حل دستگاهمعادلات خطی ax=b مطرح می شوند. سپس روش gmres ساده تر افزوده با بردار های ویژه تقریبی (sgmres-e) برای حل دستگاه ax=b بیان می شود. این روش برای تولید روش های gmres ساده تر با شروع دوباره ناقص(sgmres-dr) و gmres ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان 1389

در این پایان نامه روش تکراری کمترین باقیمانده تعمیم یافته (gmres) را یکبار با استفاده از تبدیلات گیونز و بار دیگر با استفاده از مشتق مورد بررسی قرار داده و سپس آنها را از نظر تعداد اعمال حسابی و مقدار حافظه اشغال شده مورد مقایسه قرار می دهیم. نرخ همگرایی کمترین باقیمانده تعمیم یافته (gmres) را برای سیستم خطی ax=b با ماتریس تاپ لیتز سه قطری، وقتی که b ستون اول یا آخر ماتریس همانی باشد مورد بررس...

Journal: :international journal of optimaization in civil engineering 0
s. asil gharebaghi m. ardalan asl

a new meta-heuristic method, based on neuronal communication (nc), is introduced in this article. the neuronal communication illustrates how data is exchanged between neurons in neural system. actually, this pattern works efficiently in the nature. the present paper shows it is the same to find the global minimum. in addition, since few numbers of neurons participate in each step of the method,...

2007
PETR TICHÝ

Consider a system of linear algebraic equations with a nonsingular n by n matrix A. When solving this system with GMRES, the relative residual norm at the step k is bounded from above by the so called ideal GMRES approximation. This bound is sharp (it is attainable by the relative GMRES residual norm) in case of a normal matrix A, but it need not characterize the worstcase GMRES behavior if A i...

Journal: :J. Computational Applied Mathematics 2015
Mohammed Bellalij Lothar Reichel Hassane Sadok

The GMRES method is one of the most popular iterative schemes for the solution of large linear systems of equations with a square nonsingular matrix. GMRES-type methods also have been applied to the solution of linear discrete ill-posed problems. Computational experience indicates that for the latter problems variants of the standard GMRES method, that require the solution to live in the range ...

Journal: :Filomat 2021

Based on the general inner-outer (GIO) iteration method [5,34] and framework [6], we present a multi-step matrix splitting (GMMS) for computing PageRank, analyze its overall convergence property. Moreover, same idea can be used as preconditioning technique accelerating Krylov subspace methods, such GMRES method. Finally, several numerical examples are given to illustrate effectiveness of propos...

2002
XIAO-CHUAN CAI JUN ZOU

Additive Schwarz preconditioned GMRES is a powerful method for solving large sparse linear systems of equations on parallel computers. The algorithm is often implemented in the Euclidean norm, or the discrete l norm, however, the optimal convergence theory is available only in the energy norm (or the equivalent Sobolev H norm). Very little progress has been made in the theoretical understanding...

2010
DAVOD KHOJASTEH SALKUYEH Davod Khojasteh Salkuyeh

We develop an algorithm for computing a sparse approximate inverse for a nonsymmetric positive definite matrix based upon the FFAPINV algorithm. The sparse approximate inverse is computed in the factored form and used to work with some Krylov subspace methods. The preconditioner is breakdown free and, when used in conjunction with Krylovsubspace-based iterative solvers such as the GMRES algorit...

In this paper, we present a block version of incomplete LU preconditioner which is computed as the by-product of block A-biconjugation process. The pivot entries of this block preconditioner are one by one or two by two blocks. The L and U factors of this block preconditioner are computed separately. The block pivot selection of this preconditioner is inherited from one of the block versions of...

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