Abstract
In this paper, we investigate the numerical integration problem of a real valued function generally known only on multivariate scattered points using Lobachevsky splines, a pioneering version of cardinal B-splines. Starting from their interpolation properties, we focus on the construction of new integration formulas, which are quite flexible requiring no special distribution of nodes. Numerical results using Lobachevsky splines turn out to be interesting and promising for both accuracy and simplicity in computation. Finally, a comparison with integration by radial basis functions confirms the validity of the proposed approach.
Acknowledgements
The authors gratefully acknowledge the support of the Department of Mathematics ‘G. Peano’, University of Turin, project ‘Modelling and approximation of complex systems (2010)’. The second author is grateful to the ‘Istituto Nazionale di Alta Matematica’ (INdAM) for its financial support by a research grant. Finally, the authors kindly thank the anonymous referees for their detailed and constructive comments which helped to improve the paper greatly.