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MathGroup Archive 1998

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Re: NDSolve with delayed terms in equations

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  • Subject: [mg11891] Re: NDSolve with delayed terms in equations
  • From: Bill Bertram <>
  • Date: Fri, 3 Apr 1998 03:45:46 -0500
  • Organization: ANSTO
  • References: <6fsj92$>

Alban P Tsui wrote:
> I have a set of differential equations. Usually I can solve it with
> NDSolve with no problem. However, I do not know how to solve something
> like this, say
> x'[t]==y[t]^2+x[t-a]
> y'[t]==y[t]x[t]
> with the usuaual intial conditions and a is real and positive.
> x[t-a] is a delayed term.
> What is the best way to tackle this with NDSolve?
> Alban
> P.S. Appreciate if you can send solution to me directly as well.

While browsing MathSource at the Mathematica web site (
today, I happened come across a package that may be what you're after. 
The package for Mathematica version 3.x is NDelayDSolve.m and can be
found in MathSource as Enhancements/Numerical/0209-102.

I hope this is useful to you.

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