A note on cubic polynomial interpolation

  • Authors:

  • Minghan Hu;Xiquan Shi;Tianjun Wang;Fengshan Liu

  • Affiliations:

  • Natural Language Processing Lab, Computer Science Department, Northeastern University, China;Department of Applied Mathematics, Delaware State University, Dover, DE 19901, USA;School of Mathematics and Computer Sciences, Harbin Normal University, Harbin, China;Department of Applied Mathematics, Delaware State University, Dover, DE 19901, USA

  • Venue:
  • Computers & Mathematics with Applications
  • Year:
  • 2008

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Abstract

''The NURBS Book'' [L. Piegl, W. Tiller, The NURBS Book, second edn, Springer, 1997] is very popular in the fields of computer aided geometric design (CAGD) and geometric modeling. In Section 9.5.2 of the book, the well-known problem of the local cubic spline approximation is discussed. The key in local cubic spline approximation is cubic polynomial interpolation. In this short paper, we present the concept of single-side/double-side cubic curves and obtain the necessary and sufficient condition of a cubic curve being a single-side/double-side curve. Based on this result, for some cases of two end tangents being nearly parallel we present a new method for the problem of cubic polynomial interpolation. We also point out a flaw in Section 9.5.2 of the book and give the correction result.