RT Journal Article
T1 A comparison of eigenvalue condition numbers for matrix polynomials
A1 Anguas Márquez, Luis Miguel
A1 Bueno Cachadiña, María Isabel
A1 Martínez Dopico, Froilán César
AB In this paper, we consider the different condition numbers for simple eigenvalues of matrix polynomials used in the literature and we compare them. One of these condition numbers is a generalization of the Wilkinson condition number for the standard eigenvalue problem. This number has the disadvantage of only being defined for finite eigenvalues. In order to give a unified approach to all the eigenvalues of a matrix polynomial, both finite and infinite, two (homogeneous) condition numbers have been defined in the literature. In their definition, very different approaches are used. One of the main goals of this note is to show that, when the matrix polynomial has a moderate degree, both homogeneous condition numbers are essentially the same and one of them provides a geometric interpretation of the other. We also show how the homogeneous condition numbers compare with the "Wilkinson-like" eigenvalue condition number and how they extend this condition number to zero and infinite eigenvalues. .
PB Elsevier
SN 0024-3795
YR 2019
FD 2019-03-01
LK https://hdl.handle.net/10016/32269
UL https://hdl.handle.net/10016/32269
LA eng
DS e-Archivo
RD 27 jul. 2024