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Cubic spline interpolation of functions with high gradients in boundary layers

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Abstract

The cubic spline interpolation of grid functions with high-gradient regions is considered. Uniform meshes are proved to be inefficient for this purpose. In the case of widely applied piecewise uniform Shishkin meshes, asymptotically sharp two-sided error estimates are obtained in the class of functions with an exponential boundary layer. It is proved that the error estimates of traditional spline interpolation are not uniform with respect to a small parameter, and the error can increase indefinitely as the small parameter tends to zero, while the number of nodes N is fixed. A modified cubic interpolation spline is proposed, for which O((ln N/N)4) error estimates that are uniform with respect to the small parameter are obtained.

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Authors and Affiliations

  1. Volga State University of Telecommunications and Informatics, Samara, 443090, Russia

    I. A. Blatov

  2. Sobolev Institute of Mathematics (Omsk Branch), Siberian Branch, Russian Academy of Sciences, Omsk, 644043, Russia

    A. I. Zadorin

  3. Samara State University, Samara, 443086, Russia

    E. V. Kitaeva

Authors
  1. I. A. Blatov
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  2. A. I. Zadorin
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  3. E. V. Kitaeva
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Correspondence to I. A. Blatov or A. I. Zadorin.

Additional information

Original Russian Text © I.A. Blatov, A.I. Zadorin, E.V. Kitaeva, 2017, published in Zhurnal Vychislitel’noi Matematiki i Matematicheskoi Fiziki, 2017, Vol. 57, No. 1, pp. 9–28.

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Blatov, I.A., Zadorin, A.I. & Kitaeva, E.V. Cubic spline interpolation of functions with high gradients in boundary layers. Comput. Math. and Math. Phys. 57, 7–25 (2017). https://doi.org/10.1134/S0965542517010043

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  • DOI: https://doi.org/10.1134/S0965542517010043

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