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Semiconvergence criteria of iterations and extrapolated iterations and constructive methods of semiconvergent iteration matrices

机译:迭代和外推迭代的半收敛准则以及半收敛迭代矩阵的构造方法

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In this paper we simultaneously study iterations and extrapolated iterations for the consistent rectangular or sigular linear systems Ax = b. In the case that A is rectangular, let A = M - N be a subproper splitting of A and let the generalized inverse M(T,S)(_)((1,2))exist, and in the case that A is singular, let A = M - N is a usual splitting of A. Consider the iteration x(j+1) = Gx(j) + c, where G = M-T,S((1,2)) N and C = M-T,S((1,2)) b if A is rectangular, and G = M-1 N and c = M-1 b if A is singular, and the extrapolated iteration x(j+1) = G(omega)x(i) + omega c, where omega epsilon R, omega not equal 0, 1, and G(omega) = (1 - omega))I + omega G. We establish the semiconcovergence criteria of the iterations (2.3) and (2.19), and present the efficient and convenient construction methods of the semiconvergent iteration matrices G and G(omega) and the choices of the extrapolated parameter omega.
机译:在本文中,我们同时研究了一致的矩形或矩形线性系统Ax = b的迭代和外推迭代。在A为矩形的情况下,令A = M-N为A的次适当拆分,并让广义逆M(T,S)(_)((1,2))存在,并且在A为奇异,令A = M-N是A的通常分解。考虑迭代x(j + 1)= Gx(j)+ c,其中G = MT,S((1,2))N和C = MT如果A为矩形,则S((1,2))b,如果A为奇数,则G = M-1 N,c = M-1 b,外推迭代x(j + 1)= G(ω)x (i)+ omega c,其中omega epsilon R,omega不等于0、1,并且G(omega)=(1-omega))I + omegaG。我们建立了迭代(2.3)和(2.19)的半覆盖准则),并介绍了半收敛迭代矩阵G和G(omega)的高效便捷的构造方法以及外推参数omega的选择。

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