Services & Resources / Wolfram Forums
MathGroup Archive
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2004

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

Search the Archive

Re: NDSolve Repeated convergence test failure

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


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!


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.

  • Prev by Date: Re: Expansion of an exponential expression
  • Next by Date: Re: AW: Re: Music to Mathematica
  • Previous by thread: Re: NDSolve Repeated convergence test failure
  • Next by thread: why the overflow problems when using assigned values a,b,c vs. actual numbers?