We construct an hyperinterpolation formula of degree n in the three-dimensional cube, by using the numerical cubature formula for the product Chebyshev measure given by the product of a (near) minimal formula in the square with Gauss-Chebyshev-Lobatto quadrature. The underlying function is sampled at N similar to n(3)/2 points, whereas the hyperinterpolation polynomial is determined by its (n + 1)(n + 2)(n + 3)/6 similar to n(3)/6 coefficients in the trivariate Chebyshev orthogonal basis. The effectiveness of the method is shown by a numerical study of the Lebesgue constant, which turns out to increase like log(3)(n), and by the application to several test functions.
Titolo: | Hyperinterpolation in the cube |
Autori: | |
Data di pubblicazione: | 2008 |
Rivista: | |
Handle: | http://hdl.handle.net/11562/317967 |
Appare nelle tipologie: | 01.01 Articolo in Rivista |