Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9506698 | Applied Mathematics and Computation | 2005 | 17 Pages |
Abstract
One of the less-known integration methods is the weighted Newton-Cotes of closed type quadrature rule, which is denoted by:â«a=x0b=xn=x0+nhf(x)w(x)dxââk=0nwkf(x0+kh),where w(x) is a positive function and h=b-an is a positive value. There are various cases for the weight function w(x) that one can use. Because of special importance of the weight function of Gauss-Chebyshev quadrature rules, i.e. w(x)=11-x2 in numerical analysis, we consider this function as the main weight. Hence, in this paper, we face with the following formula in fact:â«-1+1f(x)1-x2dxââk=0nwkf-1+2kn.It is known that the precision degree of above formula is n + 1 for even nâ²s and is n for odd nâ²s, however, if we consider its bounds as two additional variables we reach a nonlinear system that numerically improves the precision degree of above formula up to degree n + 2. In this way, we give several examples which show the numerical superiority of our approach.
Keywords
Related Topics
Physical Sciences and Engineering
Mathematics
Applied Mathematics
Authors
M.R. Eslahchi, Mehdi Dehghan, M. Masjed-Jamei,