A projection algorithm on the set of polynomials with two bounds
| Autor: | Pinto, Martin Campos, Charles, Frédérique, Després, Bruno, Herda, Maxime |
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| Rok vydání: | 2019 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1007/s11075-019-00872-x |
| Popis: | The motivation of this work stems from the numerical approximation of bounded functions by polynomials satisfying the same bounds. The present contribution makes use of the recent algebraic characterization found in [B. Despr\'es, Numer. Algorithms, 76(3), (2017)] and [B. Despr\'es and M. Herda, Numer. Algorithms, 77(1), (2018)] where an interpretation of monovariate polynomials with two bounds is provided in terms of a quaternion algebra and the Euler four-squares formulas. Thanks to this structure, we generate a new nonlinear projection algorithm onto the set of polynomials with two bounds. The numerical analysis of the method provides theoretical error estimates showing stability and continuity of the projection. Some numerical tests illustrate this novel algorithm for constrained polynomial approximation. Comment: Correction of first author's last name which was misspelled in previous version |
| Databáze: | arXiv |
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