Switching from exact scheme to nonstandard finite difference scheme for linear delay differential equation

S. M. Garba, Abba Gumel, A. S. Hassan, J. M S Lubuma

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

One-dimensional models are important for developing, demonstrating and testing new methods and approaches, which can be extended to more complex systems. We design for a linear delay differential equation a reliable numerical method, which consists of two time splits as follows: (a) It is an exact scheme at the early time evolution -τ≤t≤τ, where τ is the discrete value of the delay; (b) Thereafter, it is a nonstandard finite difference (NSFD) scheme obtained by suitable discretizations at the backtrack points. It is shown theoretically and computationally that the NSFD scheme is dynamically consistent with respect to the asymptotic stability of the trivial equilibrium solution of the continuous model. Extension of the NSFD to nonlinear epidemiological models and its good performance are tested on a numerical example.

Original languageEnglish (US)
Article number20728
Pages (from-to)388-403
Number of pages16
JournalApplied Mathematics and Computation
Volume258
DOIs
StatePublished - May 1 2015

Keywords

  • Delay differential equations
  • Dynamic stability
  • Exact scheme
  • Nonstandard finite difference scheme

ASJC Scopus subject areas

  • Computational Mathematics
  • Applied Mathematics

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