Gemignani, Luca (1996) *A Fast Algorithm for Hankel Matrices Represented in Orthogonal Polynomial Bases.* Technical Report del Dipartimento di Informatica . Università di Pisa, Pisa, IT.

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## Abstract

Consider a $n \times n$ lower triangular matrix $L$ whose $(i+1)$-st row is defined by the coefficients of the real polynomial $p_i(x)$ of degree $i$ such that $\{ p_i(x)\}$ is a set of orthogonal polynomials satisfying a standard three-term recurrence relation. If $H$ is a $n\times n$ real Hankel matrix with nonsingular leading principal submatrices, then $\widehat{H}=L HL^T$ will be referred as a strongly nonsingular Hankel matrix with respect to the orthogonal polynomial basis $\{p_i(x)\}$. In this paper we develop an efficient $O(n^2)$ algorithm for the solution of a system of linear equations with a real symmetric coefficient matrix $\widehat{H}$ which is a Hankel matrix with respect to a suitable orthogonal polynomial basis. We then apply our method to the solution of a weighted finite moment problem.

Item Type: | Book |
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Uncontrolled Keywords: | Hankel matrices, finite moment problems |

Subjects: | Area01 - Scienze matematiche e informatiche > INF/01 - Informatica |

Divisions: | Dipartimenti (until 2012) > DIPARTIMENTO DI INFORMATICA |

Depositing User: | dott.ssa Sandra Faita |

Date Deposited: | 26 Jan 2015 14:30 |

Last Modified: | 26 Jan 2015 14:30 |

URI: | http://eprints.adm.unipi.it/id/eprint/1963 |

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