Services & ResourcesWolfram ForumsMathGroup Archive

[Date Index] [Thread Index] [Author Index]

Re: bvdae error when using NDSolve for initial value

• To: mathgroup at smc.vnet.net
• Subject: [mg102112] Re: bvdae error when using NDSolve for initial value
• From: Alois Steindl <Alois.Steindl at tuwien.ac.at>
• Date: Wed, 29 Jul 2009 05:57:22 -0400 (EDT)
• Organization: Inst. f. Mechanics II, TU Vienna
• References: <200907280605.CAA14835@smc.vnet.net> <h4p3m1$j6i$1@smc.vnet.net>

DrMajorBob <btreat1 at austin.rr.com> writes:

> The error message is complaining, I think, about the equation
>
> w[u]==w1[u]+w2[u]
>
> Also, the equation
>
> T'[u] == 0
>
> makes T a constant.
>
> Hence, solving for T and w with NDSolve makes no sense.
>
Hello,
that's a standard trick to take care of unknown time intervals in
solving BVPs. (There are many cases, where the interval length is part
of the problem, consider e.g. periodic solutions of autonomous ODEs.)

Alois

• References:
  • bvdae error when using NDSolve for initial value problem
    • From: Damon <damonwischik@gmail.com>