MathGroup Archive 2008

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

Search the Archive

NDSolve precision and velocity problem

  • To: mathgroup at
  • Subject: [mg91295] NDSolve precision and velocity problem
  • From: Joerg Schaber <schaber at>
  • Date: Thu, 14 Aug 2008 06:58:15 -0400 (EDT)


I have an ODE system that takes lots of time to solve with NDSolve 
(several minutes),
whereas the same system with the FORTRAN solver LSODA
solves the problem in an second.
When I decrease the precision, e.g. AccuracyGoal->6, NDSolve crashes. It 
often crashes, because it finds complex values in a less-than-comparison.

Maybe it's a method problem.
How do I tell NDSolve, to use the same methods as the LSODEA solver?



  • Prev by Date: Re: Making parts of formulae blinking
  • Next by Date: Re: minimize with complex numbers
  • Previous by thread: Re: Another Out of Memory Problem
  • Next by thread: Re: NDSolve precision and velocity problem