A fast solver for a bivariate polynomial vector homogeneous interpolation problem
A fast solver for a bivariate polynomial vector homogeneous interpolation problem
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发表时间:
2002-07
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通讯作者:
R. Vandebril;M. Barel
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作者:
R. Vandebril;M. Barel
In this paper we present a fast method for solving the following bivariate interpolation problem: Given the interpolation points U ωi V ξ j W for i X I and j X J and the corresponding weights Φi Y j and Ψi Y j, we look for a polynomial vector Z p U x V y W[V q U x V y WF\ satisfying the following equation: p U ωi V ξ j W Φi Y j ] q U ωi V ξ j W Ψi Y j ^ 0 for i X I and j X J. We solve the problem by solving smaller univariate interpolation problems, which we solve with the fast interpolation solver of Van Barel and Bultheel [13]. We rewrite the polynomials p U x V y W and q U x V y W in the following form: p U x V y W_^ p0 U y W`] p1 U y W x ] p2 U y W x2 ] a[a[a q U x V y W_^ q0 U y WJ] q1 U y W x ] q2 U y W x2 ] a[a[a By substituting for y the values of ξ j we get different univariate interpolation problems in x, which we solve with the fast univariate solver. This gives b This research was partially supported by the Fund for Scientific Research–Flanders (FWO– V), project “SMA: Structured Matrices and their Applications” grant #G.0078.01, by the K.U.Leuven (Bijzonder Onderzoeksfonds), project “SLAP: Structured Linear Algebra Package,” grant #OT/00/16 and by the Belgian Programme on Interuniversity Poles of Attraction, initiated by the Belgian State, Prime Minister’s Office for Science, Technology and Culture. The scientific responsibility rests with the authors †E-mail: raf.vandebril@cs.kuleuven.ac.be ‡E-mail: marc.vanbarel@cs.kuleuven.ac.be