QR decomposition of almost strictly sign regular matrices

In this paper, LDU factorization of nonsingular sign regular and almost strictly sign regular matrices is analyzed. Besides, nonsingular almost strictly sign regular matrices are characterized through the QR factorization. Illustrative numerical examples are included.

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Bibliographic Details
Published in:Journal of computational and applied mathematics 2017-07, Vol.318, p.646-657
Main Authors: Alonso, P., Peña, J.M., Serrano, M.L.
Format: Article
Language:English
Subjects:
[formula omitted] factorization
Almost strictly sign regular matrices
Sign regular matrices
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Description
Summary:In this paper, LDU factorization of nonsingular sign regular and almost strictly sign regular matrices is analyzed. Besides, nonsingular almost strictly sign regular matrices are characterized through the QR factorization. Illustrative numerical examples are included.
ISSN:0377-0427
1879-1778
DOI:10.1016/j.cam.2015.10.030