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- Drama
- Henriette Richter-Röhl
- Neelesha Barthel
Flavio Pressacco. Nel linguaggio finanziario, revisione, in senso peggiorativo, del livello di qualità creditizia di un determinato strumento finanziario, di una società o anche di entità governative. Le società di rating e il downgrading. Il giudizio di d. (it. «declassamento») è espresso di solito da società di rating qualificate ( rating).
The authors describe a new algorithm for accurate downdating of least squares solutions and compare it to existing algorithms. Numerical test results are also presented using the sliding window method, where a number of updatings and downdatings occur repeatedly.
- A. Bjorck, H. Park, L. Elden
- 1994
A linpack downdating algorithm is being modified by interleaving its two different phases, the forward solving a triangular system and the backward sweep of Givens rotations, to yield a new forward method for finding the Cholesky decomposition of R T R − zz T.
- C. T. Pan
- 1990
Following up on a recent rank-revealing algorithm by Li and Zeng for the low nullity case, we present a new rank-revealing algorithm for low rank matrices with efficient and straightforward updating/downdating capabilities.
Abstract: The updating and downdating of Cholesky decompositions has important applications in a number of areas. There is essentially one standard updating algorithm, based on plane rotations, which is backward stable.
