Re: Re: bvdae error when using NDSolve for initial value
- To: mathgroup at smc.vnet.net
- Subject: [mg102148] Re: [mg102112] Re: bvdae error when using NDSolve for initial value
- From: DrMajorBob <btreat1 at austin.rr.com>
- Date: Thu, 30 Jul 2009 05:35:56 -0400 (EDT)
- References: <200907280605.CAA14835@smc.vnet.net> <h4p3m1$j6i$1@smc.vnet.net>
- Reply-to: drmajorbob at bigfoot.com
Too bad it didn't work, then. Bobby On Wed, 29 Jul 2009 04:57:22 -0500, Alois Steindl <Alois.Steindl at tuwien.ac.at> wrote: > 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 > -- DrMajorBob at bigfoot.com
- References:
- bvdae error when using NDSolve for initial value problem
- From: Damon <damonwischik@gmail.com>
- bvdae error when using NDSolve for initial value problem