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MathGroup Archive 2004

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Re: NDSolve Repeated convergence test failure

  • To: mathgroup at smc.vnet.net
  • Subject: [mg47236] Re: NDSolve Repeated convergence test failure
  • From: Steven Rey Ortiz <sro7516 at cs.tamu.edu>
  • Date: Wed, 31 Mar 2004 02:59:22 -0500 (EST)
  • Organization: Texas A&M University, College Station, Texas
  • References: <c3uem8$9ub$1@smc.vnet.net> <c40sv5$mrs$1@smc.vnet.net> <c43833$efv$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Rob,

Thanks for your help!  This didn't work with Mathematica 4.2, but I just
tried it on Mathematica 5 (at school) and it worked!  Problem solved!

Steve

On Mar 27, 2004, at 11:26 AM, Rob Knapp wrote:

If the equation is changing order in the middle of the integration, it is
not possible to use an ordinary ODE method on it:  all of those assume
that the equtaion is in normal form.

However, the DAE solver appears to work just fine.
Try using the option SolveDelayed->True in NDSolve.



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