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Exponential spline interpolation

Exponentielle Spline-Interpolation

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Summary

Piecewise cubic polynomial spline interpolation [3] or smoothing [4] often gives undesirable inflexion points. We describe a spline interpolation method that allows to avoid these inflexion points and contains cubic splines as special case. The method is a generalization of the work in [2]. The proof of the theorem motivating the use of exponential splines is simplified. An ALGOL procedure is presented that allows to mix piecewise cubic and exponential spline interpolation suitably.

Zusammenfassung

Interpolation [3] oder Glättung [4] von Daten mittels Splinefunktionen dritten Grades ergeben häufig unerwünschte Wendepunkte. Wir beschreiben eine Methode zur Spline-Interpolation, die es erlaubt, solche Wendepunkte zu vermeiden und die kubische Polynome als Speziaflall enthält. Das Verfahren in [2] wird verallgemeinert. Der Beweis, der die Verwendung von exponentiellen Splines motiviert, wird vereinfacht. Eine ALGOL-Prozedur wird angegeben, die es gestattet, kubische Polynome und Exponentialfunktionen bei der Spline-Interpolation geeignet zu kombinieren.

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References

  1. Boor, C. de: Bicubic Spline Interpolation. J. Math. and Phys.41, 212–218 (1962).

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  2. Schweikert, D. G.: An Interpolation Curve Using a Spline in Tension. J. Math. and Phys.45, 312–317 (1966).

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  3. Greville, T. N. E.: Spline Functions, Interpolation and Numerical Quadrature. In:Ralston, A., Wilf, H. S.: Mathematical Methods for Digital Computers, Vol. II, p. 156–168. New York: J. Wiley & Sons. 1967.

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  4. Reinsch, C. H.: Smoothing by Spline Functions. Num. Math.10, 177–183 (1967).

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Späth, H. Exponential spline interpolation. Computing 4, 225–233 (1969). https://doi.org/10.1007/BF02234771

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  • DOI: https://doi.org/10.1007/BF02234771

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