Low-rank updates of matrix functions
Low-rank updates of matrix functions
复制标题
矩阵函数的低秩更新
DOI:
--
复制
发表时间:
2017
影响因子:
1.5
通讯作者:
M. Schweitzer
中科院分区:
文献类型:
--
作者:
B. Beckermann;D. Kressner;M. Schweitzer
We consider the task of updating a matrix function $f(A)$ when the matrix $Ainmathbb{C}^{n imes n}$ is subject to a low-rank modification. In other words, we aim at approximating $f(A+D)-f(A)$ for a matrix $D$ of rank $k ll n$. The approach proposed in this paper attains efficiency by projecting onto tensorized Krylov subspaces produced by matrix-vector multiplications with $A$ and $A^*$. We prove the approximations obtained from $m$ steps of the proposed methods are exact if $f$ is a polynomial of degree at most $m$ and use this as a basis for proving a variety of convergence results, in particular for the matrix exponential and for Markov functions. We illustrate the performance of our method by considering various examples from network analysis, where our approach can be used to cheaply update centrality and communicability measures.
DOI:
10.1137/140973463
发表时间:
2014-12
期刊:
SIAM J. Matrix Anal. Appl.
影响因子:
--
作者:
A. Frommer;S. Güttel;M. Schweitzer
通讯作者:
A. Frommer;S. Güttel;M. Schweitzer