Low rank approximation in the computation of first kind integral equations with TauToolbox

• Tipo: Artigo em Revista Científica Internacional
• Data: 2024

Autores

vasconcelos, pb (Autor) FEP; Grammont, L (Autor) Outra; Lima, J (Autor) Outra

Revista

Título: Applied Numerical Mathematics

Vol. 205

Páginas: 1-15

ISSN: 0168-9274

Editora: Elsevier

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 0 Citações

Outras Informações

ID Authenticus: P-010-QY0

DOI: 10.1016/j.apnum.2024.06.022

Abstract (EN): Tau Toolbox is a mathematical library for the solution of integro-differential problems, based on the spectral Lanczos' Tau method. Over the past few years, a class within the library, called polynomial, has been developed for approximating functions by classical orthogonal polynomials and it is intended to be an easy-to-use yet efficient object-oriented framework. In this work we discuss how this class has been designed to solve linear ill-posed problems and we provide a description of the available methods, Tikhonov regularization and truncated singular value expansion. For the solution of the Fredholm integral equation of the first kind, which is built from a low-rank approximation of the kernel followed by a numerical truncated singular value expansion, an error estimate is given. Numerical experiments illustrate that this approach is capable of efficiently compute good approximations of linear discrete ill-posed problems, even facing perturbed available data function, with no programming effort. Several test problems are used to evaluate the performance and reliability of the solvers. The final product of this paper is the numerical solution of a first-kind integral equation, which is constructed using only two inputs from the user: the kernel and the right-hand side. © 2024 The Author(s)

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 14