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We study perturbation bound and structured condition number about the minimalnonnegative solution of nonsymmetric algebraic Riccati equation,obtaining a sharp per-turbation bound and an accurate condition number.By using the matrix sign functionmethod we present a new method for finding the minimal nonnegative solution of this al-gebraic Riccati equation.Based on this new method,we show how to compute the desiredM-matrix solution of the quadratic matrix equation X~2-EX-F=0 by connecting itwith the nonsymmetric algebraic Riccati equation,where E is a diagonal matrix and F isan M-matrix. 相似文献
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Nikolay Kjurkehiev 《高等学校计算数学学报(英文版)》1995,(1)
This is a study of the Durand-Kerner and Nourein methods for finding the roots of a given algebraic equation simultaneously. We consider the conditions under which the iterative methods fail. The numerical example is presented. 相似文献
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1.引言 关于代数Riccati方程(ARE)的研究是大量的.从数值角度看,有关数值方法,扰动理论的研究已比较深入.而关于条件数理论的研究则还不多[3],[6]. Ryers[1]研究了时连续代数 Riccati方程可稳解的条件数; Kenney和 Hewer[3]讨论了时连续代数 Riccati方程(以下简称 CTARE)可稳解的敏度分析,给出了一阶扰动界,引进了条件数; Sun[6]从最佳向后扰动理论角度研究了时离散代数Riccati方程(以下简称DTARE)可稳解的条件数;徐树方[8]针对 CTA… 相似文献
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1.引言若不特别说明,以下记号都是常规的,可参见山.在最优控制中占有核心地位的代数Xiccati方程(ARE)有两种基本形式:连续型的ARE(CARE):离散型的**E(**RE):其中只兄见NE贮””,GIE皿””m,GZE*m”m,in<2,*T二K>风*T二N>几*2二*2>凡从应用角度看,主要关心**E的对称半正定解.对于**RE,已有大量的研究工作.特别,陈春晖门、徐树方问、Ghwimi-Laub同等研究了扰动理论.对于DARE,它与***E的一个明显区别是:**M是二次矩阵方程而***E具有高度非线性.这种区别使得DARE远为复杂… 相似文献
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本文研究了高阶代数微分方程解的增长级的问题.利用亚纯函数的Nevanlinna值分布理论和微分方程的一些技巧,得到了一个更精确和更一般的结论,推广了何育赞和Laine的一些理论. 相似文献
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In this paper, meromorphic solutions of Riccati and linear difference equations are investigated. The growth and Borel exceptional values of these solutions are discussed, and the growth, zeros and pol... 相似文献
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利用正规实型对称空间上热核的一个上界估计及非紧致Riemann对称空间上热核 的一个梯度估计,证明了正规实型对称空间上的Littlewood-Paley平方函数算子的弱1-1 有界性. 相似文献
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针对一类变延迟微分方程,应用全隐式方法一平衡方法,研究了其收敛性和稳定性.结果表明平衡方法以1/2 γ,γ∈(0,1]阶收敛到精确解;并且强平衡方法和弱平衡方法都能保持解析解的均方稳定性;进一步数值实验验证了算法理论分析的正确性,并且表明全隐式的平衡方法比显式方法—Euler方法具有更好的稳定性. 相似文献
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An iterative process of positive solution for BVP w"+h(t)f(w)=0,w(0)=w(1)-0 is established, where h(t) is allowed to changes sign on [0,1]. The process starts from a simple function. 相似文献
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对解强刚性块线代数方程组X=(A(?)J)X φ,本文提出了L-收敛的最佳单参数迭代法(L-OOPI)和L-收敛的多参数迭代直接法(L-MPID),并给出了数值例子.数例表明,对于强刚性块线代数方程组,该二迭代法是有效的. 相似文献
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Xiao-xiaGuo Zhong-zhiBai 《计算数学(英文版)》2005,23(3):305-320
We study perturbation bound and structured condition number about the minimal nonnegative solution of nonsymmetric algebraic Riccati equation, obtaining a sharp perturbation bound and an accurate condition number. By using the matrix sign function method we present a new method for finding the minimal nonnegative solution of this algebraic Riccati equation. Based on this new method, we show how to compute the desired M-matrix solution of the quadratic matrix equation X^2 - EX - F = 0 by connecting it with the nonsymmetric algebraic Riccati equation, where E is a diagonal matrix and F is an M-matrix. 相似文献
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This paper presents a sufficient condition on the contractivity of theoretical solution for a class of nonlinear systems of delay differential equations with many variable delays(MDDEs), which is weak,compared with the sufficient condition of previous articles.In addition,it discusses the numerical stability properties of a class of special linear nmltistep methods for this class nonlinear problems.And it is pointed out that not only the backwm‘d Euler method but also this class of linear multistep methods are GRNm-stable if linear interpolation is used. 相似文献
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Lan Chieh Huang 《计算数学(英文版)》2002,20(1):35-56
1. IntroductionLet us consider the unsteady incompressible Navier--Stokes equations (INSE)on a two--dimensional rectangular region fl with boundary 0fl. Here w = (u, v)" is tl1e velocityvector, p is the pressure, and f a known vector function of x) y, and… 相似文献
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Zhong-Zhi Bai 《计算数学(英文版)》2011,29(2):185-198
We present a Hermitian and skew-Hermitian splitting (HSS) iteration method for solving large sparse continuous Sylvester equations with non-Hermitian and positive definite/semi-definite matrices. The unconditional convergence of the HSS iteration method is proved and an upper bound on the convergence rate is derived. Moreover, to reduce the computing cost, we establish an inexact variant of the HSS iteration method and analyze its convergence property in detail. Numerical results show that the HSS iteration method and its inexact variant are efficient and robust solvers for this class of continuous Sylvester equations. 相似文献