| Title: | Analysis of eigenvalue condition numbers for a class of randomized numerical methods for singular matrix pencils |
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| Authors: | ID Kressner, Daniel (Author)
ID Plestenjak, Bor (Author) |
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| Files: |  PDF - Presentation file, download (659,18 KB)
MD5: AD9B162A12460C210119CB3B30EC249B
 URL - Source URL, visit https://link.springer.com/article/10.1007/s10543-024-01033-w
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  IMFM - Institute of Mathematics, Physics, and Mechanics
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| Abstract: | The numerical solution of the generalized eigenvalue problem for a singular matrix pencil is challenging due to the discontinuity of its eigenvalues. Classically, such problems are addressed by first extracting the regular part through the staircase form and then applying a standard solver, such as the QZ algorithm, to that regular part. Recently, several novel approaches have been proposed to transform the singular pencil into a regular pencil by relatively simple randomized modifications. In this work, we analyze three such methods by Hochstenbach, Mehl, and Plestenjak that modify, project, or augment the pencil using random matrices. All three methods rely on the normal rank and do not alter the finite eigenvalues of the original pencil. We show that the eigenvalue condition numbers of the transformed pencils are unlikely to be much larger than the ▫$\delta$▫-weak eigenvalue condition numbers, introduced by Lotz and Noferini, of the original pencil. This not only indicates favorable numerical stability but also reconfirms that these condition numbers are a reliable criterion for detecting simple finite eigenvalues. We also provide evidence that, from a numerical stability perspective, the use of complex instead of real random matrices is preferable even for real singular matrix pencils and real eigenvalues. As a side result, we provide sharp left tail bounds for a product of two independent random variables distributed with the generalized beta distribution of the first kind or Kumaraswamy distribution. |
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| Keywords: | singular pencil, singular generalized eigenvalue problem, eigenvalue condition number, randomized numerical method, random matrices |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 01.09.2024 |
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| Year of publishing: | 2024 |
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| Number of pages: | 27 str. |
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| Numbering: | Vol. 64, iss. 3, article no. 32 |
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| PID: | 20.500.12556/DiRROS-20224  |
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| UDC: | 519.6 |
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| ISSN on article: | 0006-3835 |
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| DOI: | 10.1007/s10543-024-01033-w |
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| COBISS.SI-ID: | 204416003 |
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| Note: |
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| Publication date in DiRROS: | 26.08.2024 |
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| Views: | 11 |
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| Downloads: | 6 |
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| Metadata: |     |
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