Islamic Azad University, Central tehran BranchInternational Journal of Mathematical Modelling & Computations2228-622594 (Fall)20191225Approximate Solution of the Second Order Initial Value Problem by Using Epsilon Modified Block-Pulse Function283295671814ENMahnazMohammadiDepartment of Mathematics, Islamic Azad University-south Tehran Branch, Tehran, Iran.AlirezaVahidiDepartment of mathematics, Islamic Azad University-shahr rey Branch, Tehran, IranSaeidKhezerlooDepartment of Mathematics, Islamic Azad university--south Tehran Branch, Tehran, Iran.Journal Article20190610The present work approaches the problem of achieving the approximate solution of the second order initial value problems (IVPs) via its conversion into a Volterra integral equation of the second kind (VIE2). Therefore, we initially solve the IVPs using Runge–Kutta of the forth–order method (RK), and then convert it into VIE2, and apply the εmodified block–pulse functions (εMBPFs) and their operational matrix for solving VIE2, which can be transformed to a lower triangular system of algebric equations. Numerical examples show that the proposed scheme has a suitable degree of accuracy.http://ijm2c.iauctb.ac.ir/article_671814_3c4d5da00caffbda72ea84e088718119.pdf