SA

S. A. Okunuga

Department of Mathematics, University of Lagos, Lagos 23401, Nigeria

4 Publications
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Publications 4

1
Research Article Vol. 30, Issue 1

Third Derivative Block Hybrid Obrechkoff Methods

B. I. Akinnukawe*, O. A. Akinfenwa, S. A. Okunuga

This paper presents a family of Third Derivative Block Hybrid Obrechkoff Methods of Adams-type for solving stiff Initial Value Problems (IVPs). Multistep collocation techniques, with power series as basis function, are employed for the derivation of the continuous form of the hybrid methods. The continuous Hybrid Obrechkoff Methods are used to gene...

Aug, 2026 Vol. 30, Issue 1 1 views
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2
Research Article Vol. 28, Issue 1

Phase-fitted partitioned Runge-Kutta methods for separable oscillatory Hamiltonian systems and related problems

J. O. Ehigie*, S. A. Okunuga, E. Ayeni

We present an approach for deriving some phase-fitted Parti tioned Runge-Kutta (PRK) methods for numerical integration of separable Hamiltonian and related systems. The approach constitute the modification of the existing PRK such that some parameters are modified to eliminate the phase-lag and the amplification error using the analysis of phase pr...

Apr, 2019 Vol. 28, Issue 1
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3
Research Article Vol. 25, Issue 1

Block Hybrid Method for Solution of Fourth Order Ordinary Differential Equations

O. A. Akinfenwa*, H. A. Ogunseye, S. A. Okunuga

In this paper a block hybrid method of order seven for the direct solution of fourth-order ordinary differential equations is presented. The derivation of the method uses interpolation and col-location procedures to obtain the main method and additional methods from the same continuous scheme. The continuous representation of the integrators permit...

Jun, 2016 Vol. 25, Issue 1 1 views
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4
Research Article Vol. 24, Issue 1

A Seventh-order Block Integrator for Solving Stiff Systems

B. I. Akinnukawe*, S. A. Okunuga

In this paper, an L0- stable Second Derivative Block Integrator of uniform order seven is proposed for the numerical integration of stiff systems, including large stiff systems resulting from semi discretization of Parabolic differential equations. The conven tional 3-step second derivative backward differentiation formula is obtained from a contin...

Dec, 2015 Vol. 24, Issue 1
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