Glued Matrices and the MRRR Algorithm
Glued Matrices and the MRRR Algorithm
复制标题
粘合矩阵和 MRRR 算法
DOI:
10.1137/040620746
复制
发表时间:
2005
期刊:
影响因子:
--
通讯作者:
Christof Vömel
中科院分区:
文献类型:
--
作者:
I. Dhillon;B. Parlett;Christof Vömel
During the last ten years, Dhillon and Parlett devised a new algorithm (multiple relatively robust representations (MRRR)) for computing numerically orthogonal eigenvectors of a symmetric tridiagonal matrix $T$ with $\mathcal{O}(n^2)$ cost. It has been incorporated into LAPACK version 3.0 as routine {\sc stegr}.
We have discovered that the MRRR algorithm can fail in extreme cases. Sometimes eigenvalues agree to working accuracy and MRRR cannot compute orthogonal eigenvectors for them. In this paper, we describe and analyze these failures and various remedies.