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Mathematics and Computers in Simulation
Article . 2009 . Peer-reviewed
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Article . 2009
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Article . 2020
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Near best refinable quasi-interpolants

Authors: PELLEGRINO, ENZA; SANTI E.;

Near best refinable quasi-interpolants

Abstract

Let \(\mathbb{Z}\) be the set of integers and \(n\geq2\) be fixed. The authors consider the class of linearly independent refinable functions \[ M_{n,h}:=\left\{ m_{n,h}(\cdot-k),k\in\mathbb{Z}\right\} , \] where \(m_{n,h}(x)\) has support \(\left[ -n,n\right] ,\) is centered at the origin and satisfies the refinement equation: \[ m_{n,h}(x)=\sum_{k=n}^{n} a_{k,h}m_{n,h}(2x-k). \] Here the parameter \(h\geq2n-1\) and the coefficients are: \[ a_{k,h}=\frac{1}{2^{h}}\left[ \binom{2n}{k+n}+4(2^{h-2n+1}-1)\binom {2n-2}{k+n-1}\right] ,\qquad k=-n,\dots ,n. \] The authors construct the discrete \((dQIr),\) respectively the integral \((iQIr)\) refinable quasi-interpolatory operators of the form \(Q_{n} f(x)=\sum_{i\in\mathbb{Z}}\lambda_{i,l}(f)m_{i}(x),\) where \(m_{i} (x)=m_{n,h}(x-i)\) and \(\lambda_{i,l}\) have the expressions: \(\lambda_{i,l}(f)=\sum_{s\in L}c_{s,n}f(i-s),\) for \(dQIr\) and respectively \(\lambda_{i,l}(f)=\sum_{s\in L}c_{s,n},\) for \(iQIr;\) \(L=\left\{ -l,\dots ,l\right\} ,\) \(l\geq n-2\) and \(c_{s,n}=c_{-s,n} ,\;s=1,2,\dots l.\) Some coefficients \(c_{s,n}\) are determined imposing the exactness of \(dQIr\) (or \(iQIr)\) on the space of polynomials \(\mathbb{P}_{2n-3}\) and the rest of free coeficients are used in order to obtain a \(Q_{n}(f)\) with small max-norm. The operators with minimal max-norms are called near minimally normed (NMN). The authors give the explicit forms of NMN quasi-interpolants for \(n=3\) and \(n=4.\) Finally, some numerical results are given and the fact that these quasi-interpolants are suitable for approximation of functions having isolated discontinuities is illustrated.

Country
Italy
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Keywords

Approximation by operators (in particular, by integral operators), refinable function, quasi-interpolants, minimally normed operators, Interpolation in approximation theory

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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