Computing unstructured and structured polynomial pseudospectrum approximations
Computing unstructured and structured polynomial pseudospectrum approximations
复制标题
计算非结构化和结构化多项式伪谱近似
DOI:
10.1016/j.cam.2018.09.033
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发表时间:
2019
影响因子:
2.4
通讯作者:
Reichel, Lothar
中科院分区:
文献类型:
--
作者:
Noschese, Silvia;Reichel, Lothar
In many applications it is important to understand the sensitivity of eigenvalues of a matrix polynomial to perturbations of the polynomial. The sensitivity commonly is described by condition numbers or pseudospectra. However, the determination of pseudospectra of matrix polynomials is very demanding computationally. This paper describes a new approach to computing approximations of pseudospectra of matrix polynomials by using rank-one or projected rank-one perturbations. These perturbations are inspired by Wilkinson’s analysis of eigenvalue sensitivity. This approach allows the approximation of both structured and unstructured pseudospectra. Computed examples show the method to perform much better than a method based on random rank-one perturbations both for the approximation of structured and unstructured (i.e., standard) polynomial pseudospectra.
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DOI:
--
发表时间:
2006
期刊:
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通讯作者:
S. Graillat
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