## 摘要

For a given subspace, the Rayleigh-Ritz method projects the large quadratic eigenvalue problem (QEP) onto it and produces a small sized dense QEP. Similar to the Rayleigh-Ritz method for the linear eigenvalue problem, the Rayleigh-Ritz method defines the Ritz values and the Ritz vectors of the QEP with respect to the projection subspace. We analyze the convergence of the method when the angle between the subspace and the desired eigenvector converges to zero. We prove that there is a Ritz value that converges to the desired eigenvalue unconditionally but the Ritz vector converges conditionally and may fail to converge. To remedy the drawback of possible non-convergence of the Ritz vector, we propose a refined Ritz vector that is mathematically different from the Ritz vector and is proved to converge unconditionally. We construct examples to illustrate our theory.

原文 | 英語 |
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頁（從 - 到） | 941-958 |

頁數 | 18 |

期刊 | BIT Numerical Mathematics |

卷 | 53 |

發行號 | 4 |

DOIs | |

出版狀態 | 已發佈 - 2013 十二月 |

## ASJC Scopus subject areas

- 軟體
- 電腦網路與通信
- 計算數學
- 應用數學