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Efficient methods for solving a nonsymmetric algebraic Riccati equation arising in stochastic fluid models

机译:求解随机流体模型中非对称代数Riccati方程的有效方法

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We consider the nonsymmetric algebraic Riccati equation XM12X + XM11 + M22X + M-21 = 0, where M-11, M-12, M-21, M-22 are real matrices of sizes n x n, n x m, m x n, m x m, respectively, and M = [Mi(j)](i)(2),(j=1) is an irreducible singular M-matrix with zero row sums. The equation plays an important role in the study of stochastic fluid models, where the matrix -M is the generator of a Markov chain. The solution of practical interest is the minimal nonnegative solution. This solution may be found by basic fixed-point iterations, Newton's method and the Schur method. However, these methods run into difficulties in certain situations. In this paper we provide two efficient methods that are able to find the solution with high accuracy even for these difficult situations. (c) 2005 Elsevier B.V. All rights reserved.
机译:我们认为非对称代数Riccati方程XM12X + XM11 + M22X + M-21 = 0,其中M-11,M-12,M-21,M-22分别是大小为nxn,nxm,mxn,mxm的实矩阵,并且M = [Mi(j)](i)(2),(j = 1)是具有零行总和的不可约奇异M矩阵。该方程在随机流体模型的研究中起着重要作用,其中矩阵-M是马尔可夫链的生成器。实际感兴趣的解决方案是最小非负解决方案。该解决方案可以通过基本的定点迭代,牛顿法和舒尔法找到。但是,这些方法在某些情况下会遇到困难。在本文中,我们提供了两种有效的方法,即使在这些困难的情况下也能够以高精度找到解决方案。 (c)2005 Elsevier B.V.保留所有权利。

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