Re: Integrating Differential Equations with Time Delay

*To*: mathgroup at smc.vnet.net*Subject*: [mg75574] Re: [mg75534] Integrating Differential Equations with Time Delay*From*: Murray Eisenberg <murray at math.umass.edu>*Date*: Sat, 5 May 2007 06:08:25 -0400 (EDT)*Organization*: Mathematics & Statistics, Univ. of Mass./Amherst*References*: <200705040817.EAA05003@smc.vnet.net>*Reply-to*: murray at math.umass.edu

I don't think Mathematica has a built-in capability for delay-differential equations. However, there's a (free!) add-on package by Allan Hayes that implements a function NDelaySolve. See: http://library.wolfram.com/infocenter/MathSource/725/ Haider Arafat wrote: > I am not able to use NDSolve to integrate a differential equation of the > form > > u''(t) + a u(t) == b u(t-tau); > u(0) == u0; > u'(0)==udot0; > > where tau, a, and b are all constants. Is there any way to numerically > integrate this type of equations > in Mathematica. > > Any help is appreciated, > > Haider Arafat > > > -- Murray Eisenberg murray at math.umass.edu Mathematics & Statistics Dept. Lederle Graduate Research Tower phone 413 549-1020 (H) University of Massachusetts 413 545-2859 (W) 710 North Pleasant Street fax 413 545-1801 Amherst, MA 01003-9305

**References**:**Integrating Differential Equations with Time Delay***From:*"Haider Arafat" <harafat@vt.edu>