Abstract
The ULV decomposition (ULVD) is an important member of a class of rank-revealing two-sided orthogonal decompositions used to approximate the singular value decomposition (SVD). The problem of adding and deleting rows from the ULVD (called updating and downdating, respectively) is considered. The ULVD can be updated and downdated much faster than the SVD, hence its utility.
When updating or downdating the ULVD, it is necessary to compute its numerical rank. In this paper, we propose an efficient algorithm which almost always maintains rank-revealing structure of the decomposition after an update or downdate without standard condition estimation. Moreover, we can monitor the accuracy of the information provided by the ULVD as compared to the SVD by tracking exact Frobenius norms of the two small blocks of the lower triangular factor in the decomposition.
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Communicated by Lars Eldén.
The research of Peter A. Yoon was supported by the Office of Naval Research under the Fundamental Research Initiatives Program and the Azusa Pacific University Faculty Research Grant.
The research of Jesse L. Barlow was supported by the National Science Foundation under grant nos. CCR-9201612 and CCR-9424435. Part of this work was done while Jesse L. Barlow was visiting the Department of Mathematics, University of Manchester, Manchester M13 9PL, United Kingdom and the Department of Mathematics, University of Linköping, S-581 83 Linköping, Sweden.
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Yoon, P.A., Barlow, J.L. An efficient rank detection procedure for modifying the ULV decomposition. Bit Numer Math 38, 781–801 (1998). https://doi.org/10.1007/BF02510414
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DOI: https://doi.org/10.1007/BF02510414