Gauss-type quadrature rules with respect to the external zeros of the integrand
Апстракт
In the present paper, we propose a Gauss-type quadrature rule into which the external zeros of the integrand (the zeros of the integrand outside the integration interval) are incorporated. This new formula with $n$ nodes, denoted by $\mathcal G_n$, proves to be exact for certain polynomials of degrees greater than $2n-1$ (while the Gauss quadrature formula with the same number of nodes is exact for all polynomials of degrees less than or equal to $2n-1$). It turns out that $\mathcal G_n$ has several good properties: all its nodes belong to the interior of the integration interval, all its weights are positive, it converges, and it is applicable both when the external zeros of the integrand are known exactly and when they are known approximately. In order to economically estimate the error of $\mathcal G_n$, we construct its extensions that inherit the $n$ nodes of $\mathcal G_n$, and that are analogous to the Gauss-Kronrod, averaged Gauss and generalized averaged Gauss quadrature rules.... Further, we show that $\mathcal G_n$ with respect to the pairwise distinct external zeros of the integrand represents a special case of the (slightly modified) Gauss quadrature formula with preassigned nodes. The accuracy of $\mathcal G_n$ and its extensions is confirmed by numerical experiments.
Кључне речи:
Gauss quadrature formula / External zeros of the integrand / Modified weight function / Quadrature error / Convergence of a quadrature formulaИзвор:
NMLSP 2022, Book of abstracts, 2022Колекције
Институција/група
Mašinski fakultetTY - CONF AU - Tomanović, Jelena PY - 2022 UR - https://machinery.mas.bg.ac.rs/handle/123456789/5346 AB - In the present paper, we propose a Gauss-type quadrature rule into which the external zeros of the integrand (the zeros of the integrand outside the integration interval) are incorporated. This new formula with $n$ nodes, denoted by $\mathcal G_n$, proves to be exact for certain polynomials of degrees greater than $2n-1$ (while the Gauss quadrature formula with the same number of nodes is exact for all polynomials of degrees less than or equal to $2n-1$). It turns out that $\mathcal G_n$ has several good properties: all its nodes belong to the interior of the integration interval, all its weights are positive, it converges, and it is applicable both when the external zeros of the integrand are known exactly and when they are known approximately. In order to economically estimate the error of $\mathcal G_n$, we construct its extensions that inherit the $n$ nodes of $\mathcal G_n$, and that are analogous to the Gauss-Kronrod, averaged Gauss and generalized averaged Gauss quadrature rules. Further, we show that $\mathcal G_n$ with respect to the pairwise distinct external zeros of the integrand represents a special case of the (slightly modified) Gauss quadrature formula with preassigned nodes. The accuracy of $\mathcal G_n$ and its extensions is confirmed by numerical experiments. C3 - NMLSP 2022, Book of abstracts T1 - Gauss-type quadrature rules with respect to the external zeros of the integrand UR - https://hdl.handle.net/21.15107/rcub_machinery_5346 ER -
@conference{ author = "Tomanović, Jelena", year = "2022", abstract = "In the present paper, we propose a Gauss-type quadrature rule into which the external zeros of the integrand (the zeros of the integrand outside the integration interval) are incorporated. This new formula with $n$ nodes, denoted by $\mathcal G_n$, proves to be exact for certain polynomials of degrees greater than $2n-1$ (while the Gauss quadrature formula with the same number of nodes is exact for all polynomials of degrees less than or equal to $2n-1$). It turns out that $\mathcal G_n$ has several good properties: all its nodes belong to the interior of the integration interval, all its weights are positive, it converges, and it is applicable both when the external zeros of the integrand are known exactly and when they are known approximately. In order to economically estimate the error of $\mathcal G_n$, we construct its extensions that inherit the $n$ nodes of $\mathcal G_n$, and that are analogous to the Gauss-Kronrod, averaged Gauss and generalized averaged Gauss quadrature rules. Further, we show that $\mathcal G_n$ with respect to the pairwise distinct external zeros of the integrand represents a special case of the (slightly modified) Gauss quadrature formula with preassigned nodes. The accuracy of $\mathcal G_n$ and its extensions is confirmed by numerical experiments.", journal = "NMLSP 2022, Book of abstracts", title = "Gauss-type quadrature rules with respect to the external zeros of the integrand", url = "https://hdl.handle.net/21.15107/rcub_machinery_5346" }
Tomanović, J.. (2022). Gauss-type quadrature rules with respect to the external zeros of the integrand. in NMLSP 2022, Book of abstracts. https://hdl.handle.net/21.15107/rcub_machinery_5346
Tomanović J. Gauss-type quadrature rules with respect to the external zeros of the integrand. in NMLSP 2022, Book of abstracts. 2022;. https://hdl.handle.net/21.15107/rcub_machinery_5346 .
Tomanović, Jelena, "Gauss-type quadrature rules with respect to the external zeros of the integrand" in NMLSP 2022, Book of abstracts (2022), https://hdl.handle.net/21.15107/rcub_machinery_5346 .