Quadrature formulas of the Gaussian type with a diagonal weight matrix for matrix-valued functions
Abstract
This paper in the field of matrix analysis is devoted to the problem of approximate calculation of functional matrix integrals. In particular, questions of constructing and studying quadrature formulas of the highest algebraic degree of accuracy for matrix-valued functions, which would be generalisations of the corresponding (Gaussian type) quadrature rules in the case of scalar functions, are considered. Quadrature formulas of the highest algebraic degree of accuracy of various form are constructed for the approximate integration of matrix-valued functions of the second order and, as a generalisation, of an arbitrary fixed order. Particular cases of quadrature rules are considered, when a scalar or diagonal functional matrix acts as a weight function. The convergence of the proposed quadrature process to the exact value of the matrix integral is investigated. The obtained results are based on the application of certain known facts of the theory of interpolation and approximate integration of scalar functions. The presentation of the material is illustrated by some examples.
References
- Gantmakher FR. Teoriya matrits [Matrix theory]. 5th edition. Lidskii VB, editor. Moscow: Fizmatlit; 2010. 560 p. Russian.
- Krylov VI. Priblizhennoe vychislenie integralov [Approximate calculation of integrals]. 2nd edition. Moscow: Nauka; 1967. 500 p. Russian.
- Sinap A, Van Assche W. Polynomial interpolation and Gaussian quadrature for matrix-valued functions. Linear Algebra and its Applications. 1994;207:71–114. DOI: 10.1016/0024-3795(94)90005-1.
- Yanovich LA, Ignatenko MV. Interpolyatsionnye metody approksimatsii operatorov, zadannykh na funktsional’nykh prostranstvakh i mnozhestvakh matrits [Interpolation methods for approximation of operators defined on function spaces and sets of matrices]. Minsk: Belaruskaja navuka; 2020. 476 p. Russian.
Copyright (c) 2024 Journal of the Belarusian State University. Mathematics and Informatics
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
The authors who are published in this journal agree to the following:
- The authors retain copyright on the work and provide the journal with the right of first publication of the work on condition of license Creative Commons Attribution-NonCommercial. 4.0 International (CC BY-NC 4.0).
- The authors retain the right to enter into certain contractual agreements relating to the non-exclusive distribution of the published version of the work (e.g. post it on the institutional repository, publication in the book), with the reference to its original publication in this journal.
- The authors have the right to post their work on the Internet (e.g. on the institutional store or personal website) prior to and during the review process, conducted by the journal, as this may lead to a productive discussion and a large number of references to this work. (See The Effect of Open Access.)