考虑将p循环矩阵划分为k循环矩阵(2≤k≤p)来解决p循环系统Ax=b(p〉2)的SOR-k方法.Evans和Li在隐函数存在和可微的假定下,比较了SOR-k选代矩阵Lω^(K)(2≤k≤p)的最优谱半径.但是,Evans和Li并未给出此假定合理性的证明,本文将给以证明.
This paper considers a SOR-k method for solving a p-cyclic system Ax=b(p〉2)if the p-cyclic matrix Ais repartitioned as a k-cyclic matrix for 2 ≤ k ≤ p. A comparison of the optimal spectral radius of the SOR-k iteration matrix Lω^(k) for (2 ≤ k ≤ p) is given by Evans and Li under an assumption of the existence and differentiability of an implicit function. But Evans and Li have not given a reasonable proof of this assumption. In this paper, the proof of it will be given.