The numerical evaluation of singular integrals with coth-kernel

1987 ◽  
Vol 27 (3) ◽  
pp. 389-402 ◽  
Author(s):  
Walter Gautschi ◽  
M. A. Kovačević ◽  
Gradimir V. Milovanović
Keyword(s):  
Numerical Evaluation ◽  
Singular Integrals

scholarly journals Rational Transformations for Evaluating Singular Integrals by the Gauss Quadrature Rule

Mathematics ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 677
Author(s):  
Beong In Yun
Keyword(s):  
Numerical Evaluation ◽  
Singular Integrals ◽  
Quadrature Rule ◽  
Transformation Method ◽  
Gauss Quadrature ◽  
Cauchy Principal ◽  
Weakly Singular ◽  
Principal Value ◽  
Transformation Methods ◽  
Gauss Quadrature Rule

In this work we introduce new rational transformations which are available for numerical evaluation of weakly singular integrals and Cauchy principal value integrals. The proposed rational transformations include parameters playing an important role in accelerating the accuracy of the Gauss quadrature rule used for the singular integrals. Results of some selected numerical examples show the efficiency of the proposed transformation method compared with some existing transformation methods.

scholarly journals Modified Gauss-Legendre, Lobatto and Radau cubature formulas for the numerical evaluation of 2-D singular integrals

1983 ◽  
Vol 6 (3) ◽  
pp. 567-587 ◽  
Author(s):  
P. S. Theocaris
Keyword(s):  
Numerical Evaluation ◽  
Singular Integrals ◽  
Numerical Technique ◽  
Logarithmic Singularity ◽  
Complete Analysis ◽  
Cauchy Type ◽  
Two Dimensional ◽  
One Dimensional ◽  
Cubature Formulas ◽  
Principal Value

A numerical technique, first reported in 1979 in refs.[1] and [2], for the numerical evaluation of two-dimensional Cauchy-type principal-value integrals, is extended in this paper to include several cubature formlas of the Radau and Lobatto types. For the construction of such a cubature formula the 2-D singular integral is considered as an iterated one, and the second-order pole involved in this integral analyzed into a pair of complex poles. Based on this procedure, the methods of numerical integration, valid for one-dimensional singular integrals, are extanded to the case of two-dimensional singular integrals. The cubature formulas of the Lobatto- and Radau-type are now formulated to include the cases where some of the desired abscissas may be chosen accordins to any appropriate criterion.Moreover, the theory developed is enlarged to include the case of a 2-D principal-value integral, containing a logarithmic singularity. The validity of the results is illustrated by considering certain numerical examples. Furthermore, a complete analysis of the convergence and the construction of error estimates is also presented.

Numerical quadrature for computing of singular integrals

2015 ◽  
Vol 23 (2) ◽  
Author(s):  
Petr Stašek ◽  
Josef Kofron ◽  
Karel Najzar
Keyword(s):  
Numerical Evaluation ◽  
Singular Integrals ◽  
Second Order ◽  
Third Order ◽  
Rule Based ◽  
Numerical Examples ◽  
The Third ◽  
Hadamard Finite Part ◽  
Work First ◽  
Theoretical Results

AbstractThe paper is concerned with the superconvergence of numerical evaluation of Hadamard finite-part integral. Following the works [6-9], we studied the second-order and the third-order quadrature formulae of Newton-Cotes type and introduced new rules. The rule for the second-order gives the same convergence rate as the rule [6] but in more general cases, the rule for the third-order gives better results than the rule in [9] In this work, first we mention the main results on the superconvergence of the Newton-Cotes rules, we mention trapezoidal and Simpson’s rules and then we introduce a rule based on the cubic approximation. In the second part we describe important error estimates and in the last section we demonstrate theoretical results by numerical examples.

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