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MathGroup Archive 2005

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Re: NDSolve in 5.2

  • To: mathgroup at smc.vnet.net
  • Subject: [mg62431] Re: NDSolve in 5.2
  • From: marks at wolfram.com
  • Date: Thu, 24 Nov 2005 06:33:29 -0500 (EST)
  • References: <dlc9ga$m9i$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

There was a complete rewrite of NDSolve between V4.2 and V5.0, so
it is hard to tell for sure without an example.

The single most probable cause is the change to the default
AccuracyGoal and PrecisionGoal.
In V4.2 they were 6 whereas since V5.0 they are 8. You could set them
explicitly to 6 and see if
that works - of course it will give a less accurate solution as V4.2
did:

NDSolve[...,AccuracyGoal->6, PrecisionGoal->6]

Mark Sofroniou
Research and Development
Wolfram Research


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