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arXiv 2204.12976math.NAcs.NA
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李雅普诺夫算子φ-函数的计算及其在矩阵指数积分中的应用

Computing the Lyapunov operator φ-functions, with an application to matrix-valued exponential integrators

Dongping Li, Yue Zhang, Xiuying Zhang

摘要:

在本文中,我们开发了有效的和准确的评估李雅普诺夫算子函数$φ_l(\mathcal{L}_A)[Q],$,其中$φ_l(\cdot)$是与指数相关的函数,$\mathcal{L}_A$是李雅普诺夫算子和$Q$是一个对称和满秩矩阵。该算法的一个重要应用是矩阵微分方程(如微分李雅普诺夫方程和微分黎卡提方程)的矩阵值指数积分。该方法是利用改进的缩放和平方过程结合截断泰勒级数。提出了一种准向后误差分析方法来确定尺度参数的值和泰勒逼近的阶数。数值实验表明,该算法在精度和效率上都有较好的表现。

英文摘要:

In this paper, we develop efficient and accurate evaluation for the Lyapunov operator function $φ_l(\mathcal{L}_A)[Q],$ where $φ_l(\cdot)$ is the function related to the exponential, $\mathcal{L}_A$ is a Lyapunov operator and $Q$ is a symmetric and full-rank matrix. An important application of the algorithm is to the matrix-valued exponential integrators for matrix differential equations such as differential Lyapunov equations and differential Riccati equations. The method is exploited by using the modified scaling and squaring procedure combined with the truncated Taylor series. A quasi-backward error analysis is presented to determine the value of the scaling parameter and the degree of the Taylor approximation. Numerical experiments show that the algorithm performs well in both accuracy and efficiency.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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