A parametrization of structure-preserving transformations for matrix polynomials
A parametrization of structure-preserving transformations for matrix polynomials
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矩阵多项式的结构保持变换的参数化
DOI:
10.1016/j.laa.2023.05.024
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发表时间:
2023
影响因子:
1.1
通讯作者:
Garvey S
中科院分区:
文献类型:
--
作者:
Garvey S
Given a matrix polynomial A (λ) of degree d and the associated vector space of pencils DL (A) described in Mackey et al.[12], we construct a parametrization for the set of left and right transformations that preserve the block structure of such pencils. They form a special class of structure-preserving transformations (SPTs). An SPT in that class maps DL (A) to DL (A˜), where A˜(λ) is a new matrix polynomial that is still of degree d and whose finite and infinite eigenvalues and their partial multiplicities are the same as those of A (λ). Unlike previous work on SPTs, we do not require the leading matrix coefficient of A (λ) to be nonsingular. We show that additional constraints on the parametrization lead to SPTs that also preserve extra structures in A (λ) such as symmetric, alternating, and T-palindromic structures. Our parametrization allows easy construction of SPTs that are low-rank modifications of the identity matrix. The latter transform A (λ) into a matrix polynomial A˜(λ) whose jth matrix coefficient A˜ j is a low-rank modification of A j. We expect such SPTs to be one of the key tools for developing algorithms that reduce a matrix polynomial to Hessenberg form or tridiagonal form in a finite number of steps and without the use of a linearization.
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影响因子:
1.1
作者:
Leo Taslaman;F. Tisseur;I. Zaballa
通讯作者:
Leo Taslaman;F. Tisseur;I. Zaballa
DOI:
10.1007/b137517
发表时间:
2005-12
期刊:
--
影响因子:
--
作者:
I. Gohberg;P. Lancaster;L. Rodman
通讯作者:
I. Gohberg;P. Lancaster;L. Rodman
影响因子:
1.1
作者:
L. Grammont;N. Higham;F. Tisseur
通讯作者:
L. Grammont;N. Higham;F. Tisseur
DOI:
--
发表时间:
2005
期刊:
影响因子:
--
作者:
I. Gohberg;P. Lancaster;L. Rodman
通讯作者:
L. Rodman
DOI:
--
发表时间:
2004
期刊:
影响因子:
--
作者:
S. Garvey;U. Prells;M. Friswell;Zheng Chen
通讯作者:
Zheng Chen