Numerische Mathematik

, Volume 121, Issue 3, pp 461–471

On the Lebesgue constant of barycentric rational interpolation at equidistant nodes


    • Department of Computer ScienceUniversity of Verona
  • Stefano De Marchi
    • Department of Pure and Applied MathematicsUniversity of Padua
  • Kai Hormann
    • Faculty of InformaticsUniversity of Lugano
  • Georges Klein
    • Department of MathematicsUniversity of Fribourg

DOI: 10.1007/s00211-011-0442-8

Cite this article as:
Bos, L., De Marchi, S., Hormann, K. et al. Numer. Math. (2012) 121: 461. doi:10.1007/s00211-011-0442-8


Recent results reveal that the family of barycentric rational interpolants introduced by Floater and Hormann is very well-suited for the approximation of functions as well as their derivatives, integrals and primitives. Especially in the case of equidistant interpolation nodes, these infinitely smooth interpolants offer a much better choice than their polynomial analogue. A natural and important question concerns the condition of this rational approximation method. In this paper we extend a recent study of the Lebesgue function and constant associated with Berrut’s rational interpolant at equidistant nodes to the family of Floater–Hormann interpolants, which includes the former as a special case.

Mathematics Subject Classification (2000)


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© Springer-Verlag 2011