Abstract
In this paper, we concern with the data interpolation by using extended cubic uniform B-splines with shape parameters. Two iterative formats, namely the progressive iterative approximation (PIA) and the weighted progressive iterative approximation (WPIA), are proposed to interpolate given data points. We study the optimal shape parameter and the optimal weight for the proposed methods by solving the eigenvalues of the collocation matrix. The optimal shape parameter can make the iterative methods not only have the fastest convergence speed but also have smallest initial interpolation error. Numerical experiments are given to illustrate the effectiveness of the proposed methods.
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Notes
A matrix is called totally positive if all its minors are positive. A basis \(\{b_{i}(t)\}_{i=0}^{n}\) is called normalized if \(b_{i}(t)\ge 0\) and \(\sum \limits _{i=0}^{n}b_{i}(t)=1\); totally positive if its collocation matrix at any increasing sequence is a totally positive matrix.
A matrix is called stochastic if it is nonnegative and the sum of the entries of each row equals to 1.
A matrix is called Toeplitz if its entries along the diagonal are constant.
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Acknowledgements
The research is supported by National Natural Science Foundation of China (Grant No. 11771453), Natural Science Foundation of Hunan Province (Grant No. 2020JJ5267), Scientific Research Funds of Hunan Provincial Education Department (Grant No. 18C877).
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Communicated by Theodore E. Simos.
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Yi, Y., Hu, L., Liu, C. et al. Progressive Iterative Approximation for Extended Cubic Uniform B-Splines with Shape Parameters. Bull. Malays. Math. Sci. Soc. 44, 1813–1836 (2021). https://doi.org/10.1007/s40840-020-01034-2
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DOI: https://doi.org/10.1007/s40840-020-01034-2
Keywords
- Progressive iterative approximation
- Extended cubic uniform B-spline
- Shape parameter
- Convergence rate
- Spectral radius