### Abstract

Original language | English |
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Pages (from-to) | 3189-3205 |

Number of pages | 17 |

Journal | Linear Algebra and its Applications |

Volume | 435 |

Issue number | 12 |

Early online date | 19 Jul 2011 |

DOIs | |

Publication status | Published - 15 Dec 2011 |

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*Linear Algebra and its Applications*,

*435*(12), 3189-3205. https://doi.org/10.1016/j.laa.2011.06.012

**A Newton-based method for the calculation of the distance to instability.** / Freitag, Melina A; Spence, Alastair.

Research output: Contribution to journal › Article

*Linear Algebra and its Applications*, vol. 435, no. 12, pp. 3189-3205. https://doi.org/10.1016/j.laa.2011.06.012

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TY - JOUR

T1 - A Newton-based method for the calculation of the distance to instability

AU - Freitag, Melina A

AU - Spence, Alastair

PY - 2011/12/15

Y1 - 2011/12/15

N2 - In this paper, a new fast algorithm for the computation of the distance of a stable matrix to the unstable matrices is provided. The method uses Newton’s method to find a two-dimensional Jordan block corresponding to a pure imaginary eigenvalue in a certain two-parameter Hamiltonian eigenvalue problem introduced by Byers [R. Byers, A bisection method for measuring the distance of a stable matrix to the unstable matrices, SIAM J. Sci. Statist. Comput. 9 (1988) 875–881]. This local method is augmented by a test step, previously used by other authors, to produce a global method. Numerical results are presented for several examples and comparison is made with the methods of Boyd and Balakrishnan [S. Boyd, V. Balakrishnan, A regularity result for the singular values of a transfer matrix and a quadratically convergent algorithm for computing its L∞-norm, Systems Control Lett. 15 (1990) 1–7] and He and Watson [C. He, G.A. Watson, An algorithm for computing the distance to instability, SIAM J. Matrix Anal. Appl. 20 (1999) 101–116].

AB - In this paper, a new fast algorithm for the computation of the distance of a stable matrix to the unstable matrices is provided. The method uses Newton’s method to find a two-dimensional Jordan block corresponding to a pure imaginary eigenvalue in a certain two-parameter Hamiltonian eigenvalue problem introduced by Byers [R. Byers, A bisection method for measuring the distance of a stable matrix to the unstable matrices, SIAM J. Sci. Statist. Comput. 9 (1988) 875–881]. This local method is augmented by a test step, previously used by other authors, to produce a global method. Numerical results are presented for several examples and comparison is made with the methods of Boyd and Balakrishnan [S. Boyd, V. Balakrishnan, A regularity result for the singular values of a transfer matrix and a quadratically convergent algorithm for computing its L∞-norm, Systems Control Lett. 15 (1990) 1–7] and He and Watson [C. He, G.A. Watson, An algorithm for computing the distance to instability, SIAM J. Matrix Anal. Appl. 20 (1999) 101–116].

UR - http://www.scopus.com/inward/record.url?scp=80051601686&partnerID=8YFLogxK

UR - http://dx.doi.org/10.1016/j.laa.2011.06.012

U2 - 10.1016/j.laa.2011.06.012

DO - 10.1016/j.laa.2011.06.012

M3 - Article

VL - 435

SP - 3189

EP - 3205

JO - Linear Algebra and its Applications

JF - Linear Algebra and its Applications

SN - 0024-3795

IS - 12

ER -