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Recently Y. Saad proposed a flexible inner-outer preconditioned GMRES algorithm for nonsymmetric linear systems [4]. Following their ideas, we suggest an adaptive preconditioned CGS method, called CGS/GMRES (k), in which the preconditioner is constructed in the iteration step of CGS, by several steps of GMRES(k). Numerical experiments show that the residual of the outer iteration decreases rapidly. We also found the interesting residual behaviour of GMRES for the skewsymmetric linear system Ax = b, which gives a convergence result for restarted GMRES (k). For convenience, we discuss real systems. 相似文献
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针对中国上市公司中的一类特殊群体——创业板,近期监管层发布了两项新规:一为创业板半年报新规出炉,增添多项披露要求;一为财务准入标准将适度放宽,优化资本市场制度安排。两项新规,影响几何? 相似文献
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