Research Article | Open Access

Volume 2015 |Article ID 468629 | https://doi.org/10.1155/2015/468629

S. Hatami, S. M. Hashemiparast, S. Shateyi, "On the Birkhoff Quadrature Formulas Using Even and Odd Order of Derivatives", Mathematical Problems in Engineering, vol. 2015, Article ID 468629, 8 pages, 2015. https://doi.org/10.1155/2015/468629

# On the Birkhoff Quadrature Formulas Using Even and Odd Order of Derivatives

Accepted13 Feb 2015
Published01 Jun 2015

#### Abstract

We introduce some New Quadrature Formulas by using Jacoby polynomials and Laguerre polynomials. These formulas can be obtained for a finite and infinite interval and also separately for the even or odd order of derivatives. By using the properties of error functions of the above orthogonal polynomials we can obtain the error functions for these formulas. Application of the new approaches increases their precision degrees. Finally, some examples are given to illuminate the details.

#### 1. Introduction

Let be a positive integer, the derivative of order for the function , the set of polynomials of degree at most , and a positive and integrable function on the interval throughout this paper.

We consider the quadrature formula as follows:

If are chosen as the distinct zeros of orthogonal polynomial of degree in the family of orthogonal polynomials [1, 2] associated with , then the formulais exact for . That is, the positive weights are usually determined in a way that formula (2) is exact for the polynomials of degree as high as possible. Attempts to obtain similar quadrature formulas have not been restricted just to ; many researchers began to obtain some New Quadrature Formulas based on and its derivatives. For example, Turán was among the first who considered in his interesting paper in 1950  the following quadrature rules:

Milovanovic and Varma  have given two types of and quadrature formulas. These quadrature formulas are exact for polynomials of degree at most . Suzuki  considered a special type of incidence matrices defined by , and and obtained a special class of Hermie-Birkhoff quadrature as follows:where (6) is exact for any polynomials with degree at most and s are weight-coefficient independent of . Lénárd  obtained a Birkhoff-type quadrature formula with Laguerre abscissas as follows:where and are the zeros of the Laguerre polynomials and , respectively [1, 2]. Equation (7) is also exact for the polynomials of degree at most . She gives in another paper , a Birkhoff quadrature formula as follows:which is exact for the polynomials of degree . She considered that the nodes and to solve (8) are the zeros of the ultraspherical polynomials and , respectively.

Eslahchi and Dehghan  obtained two formulas as follows:where and are the roots of Jacobi Polynomials and Laguerre Polynomials , respectively.

In this paper we intend to obtain some New Quadrature Formulas for the even or odd degree of derivatives separately. For instance, if we consider the even order of derivatives in the finite interval , then we can obtain the formula as follows:

Also, if we consider the odd order of derivatives in the finite interval we get another quadrature formula. Replacing instead , we obtain two other formulas for the even or odd degree of derivatives.

The paper is organized as follows: in Section 2 we introduce Gauss-Jacobi quadrature and Gauss-Laguerre quadrature rules. In Section 3 we express the algorithms for obtaining New Quadrature Formulas and the error functions. Section 4 contain some examples for illumination and details.

#### 2. Preliminaries

In this section we introduce briefly the quadrature rules based on orthogonal polynomials. So, we consider the general form of weighted quadrature rules  which is defined aswhere , are unknown coefficients, unknown nodes, and the predetermined nodes. The error function , , can be determined by

For   (11) changes to

It can be proved among the quadrature rules that the Gaussian quadrature (for in (13)) has the highest precision degree (). In other words

Obviously the nodes are the zeros of a sequence of polynomials , which are orthogonal  with respect to on ; that is,where is the Kronecker delta. Moreover, we simply can compute the coefficients by using the following formula :where

Let us consider (Jacobi weight function) with on , so, (13) can be written aswhere are the zeros of Jacobi polynomials on which are defined  bywhere . Furthermore if has a continuous derivative of order on then the reminder term of formula   (13) is given as

Another class of quadrature rules that is applicable in this paper is Gauss-Laguerre quadrature that can be obtained by selecting the interval of quadrature and in (13). So, we havewhere are the zeros of Laguerre polynomials  of the formand the weight functions are as follows:and error of this quadrature formula is

Also if in (21), it is called Gauss-Laguerre quadrature formulas.

##### 3.1. New Quadrature Formulas in Finite Interval

In this section we obtain two New Quadrature Formulas. It should be noted that we must use the even or odd degree of derivatives separately. By using error function (20) for Jacobi quadrature formulas we can obtain the error functions for these quadrature formulas. Error functions can also be obtained by a similar process for the error of composed trapezoidal rules [23, page 129]. We first consider the even order of derivatives and because of similarity ignore the odd degree of derivatives. Now, we havesuch thatthen we have

Now, consider the integral in the right-hand side of (27) and use the following change of variable: which gives

Substituting (29) into (27) gives

If we apply the Gauss-Jacobi quadrature rules with respect to the weight function on for (instead of in (18)), we obtain the following new relation:where and are previously defined in ((19)-(20)). The degree of the error function in (31) is . Now, if we put we haveby substituting ((31), (33)) in (30) again, we get

Here, we consider integration in the right-hand side of (34) and we use again the following change of variable: then we can writesubstituting (36) into (34), then we get

Now, we consider ((38)-(39)) and substitute these formulas into (37). Consider

Therefore, we have

It is worthy of attention that the degree of error function in (39) is . If we apply this process only for the even degree of derivatives, then for th order of derivatives we can obtain the relation as follows:

By iterating this process and using the even order of derivatives we write the quadrature formulae as follows:where shows twice the coefficient of last part of summation. The precision degree in this formula is , which indicates the advantages of the new approach. Now, we consider the error functions for this formula:

For simplifying the error term of (42) from points, we consider the error functions for composed trapezoidal rules and we will obtain a relation that is similar to the relation built in [23, page 129]

Let us consider the following relations:

Adding the left sides and right sides of (46), respectively, gives

Finally, we have

Now, we suppose is continuous; there exist a such that [23, page 129]

Thus, we have

Apply the process for the odd order of derivatives gives another Quadrature Formula:Similar to the even degree of derivatives we can obtain the error function for the odd degree of derivatives with the precision degree .

##### 3.2. New Quadrature Formulas in Infinite Interval

Let us extend the results to infinite interval . In this section we also use the even or odd degree of derivatives similar to the pervious section and try to obtain error function for these formulas. We follow the same procedure in the previous section: then we have

The Gauss-Laguerre quadrature rules can be shown:where are obtained from (23) and are the roots of Laguerre polynomials and the error function is

Now, if we consider the even degree of derivatives and use the process for New Quadrature Formulas similar to the even order of derivatives in finite intervals (previous part) we can obtain another formula for quadrature formulae as follows:and if we consider the odd degree of derivatives we have

To obtain a formula for the error function considering (55) and using (54) givesand for we have

Again, we consider previous part for calculating the error function in finite intervals.

#### 4. Numerical Examples

In this section we want to present two examples to clarify the details. We use the notations and examples introduced in .

Let  = -points quadrature formulas with parameters for -order derivatives, respectively, in finite intervals;  = -points quadrature formulas with parameter for -order derivatives in infinite intervals; = Exact value − Approximation value.

Example 1. As the first example for quadrature formulae in , we use the following integral:
This example is computed for , , and quadrature formulas by using (42) for and the results are obtained and tabulated in Tables 1 and 2.

 1 0.3798784407 2 0.3798802883 3 0.3798852701 4 0.3798859533 5 0.3798855961 6 0.3798854710 7 0.3798854803 8 0.3798854927 9 0.3798854941
 2 0.3798983625 3 0.3798805451 0.3798808675 4 0.3798802910 0.3798802953 5 0.3798802883 0.379880288 6 0.3798802883 0.379880288 7 0.3798802883 0.379880288 8 0.3798802883 0.379880288 9 0.3798802883

Example 2. For infinite interval , (55) is considered for computing where .
This example is also computed for , , and quadrature formulas and the results tabulated in Tables 3 and 4.

 1 0.4133137157 2 0.4133121416 0.4133131291 3 0.4133097907 0.4133087904 4 0.4133088464 0.4133087681 5 0.4133086998 0.4133087595 6 0.4133087434 0.4133087588 7 0.4133087622 0.4133087587 8 0.4133087643 0.4133087587
 3 0.4133090947 4 0.4133087725 5 0.4133087597 6 0.4133087588 7 0.4133087587 8 0.4133087587

#### 5. Conclusion

In this paper we introduced some New Quadrature Formulas by using Jacoby polynomials and Laguerre polynomials for a finite and infinite interval and also separately for the even or odd order of derivatives. The error functions of the above orthogonal polynomials are obtained for these formulas. The precision degrees are increased.

#### Conflict of Interests

The authors declare that there is no conflict of interests regarding the publication of this paper.

1. W. Gautschi, Orthogonal Polynomials, Oxford University Press, 2004. View at: MathSciNet
2. T. S. Chihara, An Introduction to Orthogonal Polynomials, Gordon and Breach Science, New York, NY, USA, 1978. View at: MathSciNet
3. P. Turán, “On the theory of the mechanical quadrature,” Acta Universitatis Szegediensis, vol. 12, pp. 30–37, 1950. View at: Google Scholar | MathSciNet
4. M. M. Spalević, “Calculation of Chakalov-Popoviciu quadratures of Radau and Lobatto type,” The ANZIAM Journal, vol. 43, no. 3, pp. 429–447, 2002. View at: Google Scholar | MathSciNet
5. G. V. Milovanovic and M. M. Spalevic, “Gauss-Tur\'an quadratures of Kronrod type for generalized Chebyshev weight functions,” Calcolo, vol. 43, no. 3, pp. 171–195, 2006. View at: Publisher Site | Google Scholar | MathSciNet
6. Y. G. Shi, “On Turán quadrature formulas for the Chebyshev weight,” Journal of Approximation Theory, vol. 96, no. 1, pp. 101–110, 1999. View at: Publisher Site | Google Scholar | MathSciNet
7. Y. G. Shi, “Turán quadrature formulas and christoffel type functions for the chebyshev polynomials of the second kind,” Acta Mathematica Hungarica, vol. 85, no. 3, pp. 253–263, 1999. View at: Publisher Site | Google Scholar | MathSciNet
8. L. Gori and C. A. Micchelli, “On weight functions which admit explicit Gauss-Turan quadrature formulas,” Mathematics of Computation, vol. 65, no. 216, pp. 1567–1581, 1996. View at: Publisher Site | Google Scholar | MathSciNet
9. K. Jetter, “A new class of Gaussian quadrature formulas based on Birkhoff type data,” SIAM Journal on Numerical Analysis, vol. 19, no. 5, pp. 1081–1089, 1982. View at: Publisher Site | Google Scholar | MathSciNet
10. N. Dyn and K. Jetter, “Existence of Gaussian quadrature formulas for Birkhoff type data,” Archiv der Mathematik, vol. 52, no. 6, pp. 588–594, 1989. View at: Publisher Site | Google Scholar | MathSciNet
11. K. Jetter, “Uniqueness of Gauss-Birkhoff quadrature formulas,” SIAM Journal on Numerical Analysis, vol. 24, no. 1, pp. 147–154, 1987. View at: Publisher Site | Google Scholar | MathSciNet
12. B. Bojanov and G. Nikolov, “Comparison of Birkhoff type quadrature formulae,” Mathematics of Computation, vol. 54, no. 190, pp. 627–648, 1990. View at: Publisher Site | Google Scholar | MathSciNet
13. L. L. Wang and B. Y. Guo, “Interpolation approximations based on Gauss-Lobatto-LEGendre-Birkhoff quadrature,” Journal of Approximation Theory, vol. 161, no. 1, pp. 142–173, 2009. View at: Publisher Site | Google Scholar | MathSciNet
14. G. V. Milovanović and R. Ž. Đorđević, “On a generalization of modified Birkhoff-Young quadrature formula,” Univerzitet u Beogradu, Publikacije Elektrotehniv ckog Fakulteta, pp. 130–134, 1982. View at: Google Scholar
15. A. K. Varma, “On some open problems of P. Turán concerning Birkhoff interpolation,” Transactions of the American Mathematical Society, vol. 274, no. 2, pp. 797–808, 1982. View at: Publisher Site | Google Scholar | MathSciNet
16. A. K. Varma, “On Birkhoff quadrature formulas,” Proceedings of the American Mathematical Society, vol. 97, no. 1, pp. 38–40, 1986. View at: Publisher Site | Google Scholar | MathSciNet
17. A. K. Varma, “On Birkhoff quadrature formulas II,” Acta Mathematica Hungarica, vol. 62, no. 1-2, pp. 15–19, 1993. View at: Publisher Site | Google Scholar | MathSciNet
18. G. V. Milovanovic and A. K. Varma, “On Birkhoff (0,3) and (0,4) quadrature formula,” Numerical Functional Analysis and Optimization, vol. 18, no. 3-4, pp. 427–433, 1997. View at: Publisher Site | Google Scholar | MathSciNet
19. C. Suzuki, “Two-point Hermite-Birkhoff quadrature and its applications to numerical solution of ODE,” in Numerical Analysis of Ordinary Differential Equations and Its Applications, vol. 18, pp. 43–57, 1997. View at: Google Scholar
20. M. Lénárd, “PAL-type interpolation and quadrature formulae on Laguerre abscissas,” Mathematica Pannonica, vol. 15, no. 2, pp. 265–274, 2004. View at: Google Scholar | MathSciNet
21. M. Lénárd, “Birkhoff quadrature formulae based on the zeros of jacobi polynomials,” Mathematical and Computer Modelling, vol. 38, no. 7–9, pp. 917–927, 2003. View at: Publisher Site | Google Scholar | MathSciNet
22. M. R. Eslahchi and M. Dehghan, “Quadrature rules using an arbitrary fixed order of derivatives,” Computers & Mathematics with Applications, vol. 57, no. 7, pp. 1212–1225, 2009. View at: Publisher Site | Google Scholar | MathSciNet
23. J. Stoer and P. Bulirsch, Introduaction to Numerical Analysis, Springer, New York, NY, USA, 2nd edition, 1993.
24. V. I. Krylov, Approximate Calculation of Integrals, Macmillan, New York, NY, USA, 1962. View at: MathSciNet
25. R. Davis and P. Rabinowitz, Methods of Numerical Integration, Computer Science and Applied Mathematics, Academic Press, New York, NY, USA, 2nd edition, 1984. View at: MathSciNet
26. G. M. Phillips, Interpolation and Approximation by Polynomials, Springer, New York, NY, USA, 2003. View at: Publisher Site | MathSciNet
27. W. H. Press, S. A. Teukolsky, W. T. Vetterling, and B. P. Flannery, Numerical Recipes in Fortran: The Art of Scientific Computing, Cambridge University Press, Cambridge, UK, 2nd edition, 1992. View at: MathSciNet
28. A. Ghizzetti and A. Ossicini, Quadrature Formulae, Academic Press, New York, NY, USA, 1970. View at: MathSciNet