Numerical Solution of the Initial Value Problem of the Ordinary Differential Equation with Singular Point by Multi-Step Integration Method
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1 Nuerical o te Initial Value Proble o te Ordinar Dierential Equation wit Singular Point b MultiStep Integration Metod KANOKNAPA ERAWUN Kase Bundit Universit Suanluang Bangkok Tailand Abstract. In [] M. Podisuk U. Candang and W. Sanprasert introduced te ultistep integration etod to ind te nuerical solution o te initial value proble o te ordinar dierential equation. W. Sanprasert U. Candang and M. Podisuk in [] used te integration etod wit ortogonal polnoials to ind te nuerical solution o te initial value proble o ordinar dierential equation wit singular point. In tis paper we use te ultistep integration etod in [] to ind te proble in []. Te results b coputer prograing will be illustrated and copare wit te results in []. Kewords: ultistepetod integrationetod Talor series epansion I. Introduction. Te initial value proble o ordinar dierential equation is o te ro () ( ) [a b] () wit te initial condition ( a) () Te above equations are equivalent to te integral equation () (t )dt () a Instead o solving te equations () and () we a solve equation (). We rewrite te equation () as ( )dt () II. Forulation Twopoint orula. We begin b solving or wit te ollowing orula () we use te Talor epansion to ind te value o. Ten we solve or... b te ollowing orula [ ( )]. () Now we solve or te values o... as te sae as inding te values o... Treepoint orula. We begin b solving or and wit te ollowing orulas (7) (8) we use te Talor epansion to ind te value o and. Ten we solve or... b te ollowing orula [ ( ) ( )]. (9) Now we solve or te values o... as te sae as inding te values o.... Fourpoint orula. ISSN: 79 9 ISBN: 97897
2 We begin b solving or and wit te ollowing orula () () () we use te Talor epansion to ind te values o and. Ten we solve or... b te ollowing orula [ ] () Now we solve or te values o... as te sae as inding te values o.... Fivepoint orula. We begin b solving or and wit te ollowing orulas ( ) () () (7) we use te Talor epansion to ind te values o and. Ten we solve or... b te ollowing orula ADVANCES in MATHEMATICAL and COMPUTATIONAL METHODS ISSN: 79 ISBN: 97897
3 [ ( ) ] (8) Now we solve or te values o... as te sae as inding te values o... Sipoint orula. We begin b solving or and wit te ollowing orulas (9 ) () () () () we use te Talor epansion to ind te values o and. Ten we solve or 7... b te ollowing orula [ ] () Now we solve or te values o... as te sae as inding te values o.... ADVANCES in MATHEMATICAL and COMPUTATIONAL METHODS ISSN: 79 ISBN: 97897
4 III. Eaple. Find te nuerical solution o te equation sin ( ) [ ] () wit te initial condition.8888 () Let n and. Te analtical solution o te equations () A() () is () e were 7 A()... (7)!! 7 7! Ten te initial to reer tat equation () (7) we use ind results b tat orulas ()() Te results o te indicated orulas are sown in Tables Table Twopoint orula. H.... Eact Approiated Table Treepoint orula. H.... Eact Approiated ISSN: 79 ISBN: 97897
5 Table Fourpoint orula. Table Sipoint orula. H.... Eact Approiated H.... Eact Approiated Table Fivepoint orula. H.... Eact Approiated Table Global error. Forula..7 Approiated Twopoint Treepoint.7.8 Fourpoint.7.88 Fivepoint.7. Si point.7.8 ISSN: 79 ISBN: 97897
6 IV. Conclusion. Te results are as good as epected. However te twopoint etod is good as te rest. Tere are no signiicant dierent between te. So we recoend te twopoint etod. Note tat our result is not as good as te result in [] since our procedure use te Talor epansion onl at te beginning wic saved uc o coputer eecution tie. V. Reerences. Integration Metod or Solving te Initial Value Proble o Ordinar Dierential Equation (Maitree Podisuk and Wannaporn Sanprasert) KMITL SCIENCE JOURNAL Vol. No. Februar page 9 Integration Metod wit Ortogonal Polnoials (Wannaporn Sanprasert Ungsana Cundang and Maitree Podisuk)Proceeding o te t WSEAS International Conerence on Applied Coputer and Applied Coputational Science Hangzou Cina Ma 9 page ISSN: 79 ISBN: 97897
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