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Re: NDSolve Mathematica 6 and 7

• To: mathgroup at smc.vnet.net
• Subject: [mg103364] Re: [mg103336] NDSolve Mathematica 6 and 7
• From: DrMajorBob <btreat1 at austin.rr.com>
• Date: Thu, 17 Sep 2009 06:21:44 -0400 (EDT)
• References: <200909160946.FAA12985@smc.vnet.net>
• Reply-to: drmajorbob at yahoo.com

Send details, Mark. Details.

Bobby

On Wed, 16 Sep 2009 04:46:29 -0500, Mark Perrin <m.perrin at me.com> wrote:

> I was wondering if anyone could help me. I am solving a set of partial
> and ordinary differential equations in Mathematica 7. For the same set
> of equations and same expression i.e.
>
> solution =
>   NDSolve[EQNS, STATES, {t, 0, 500}, {x, 0, 1.6}, MaxStepSize -> {1,
> 0.01},
>    MaxSteps -> Infinity, AccuracyGoal -> 5, PrecisionGoal -> 5]
>
> where EQNS are the ODEs.
>
> Mathematica 6 solves this in < 5 minutes.
> Mathematica 7 takes about 40-45 minutes.
> for the same solution.
>
> Same hardware etc.
>
> Can anyone please tell me if it is possible to speed up the solution
> in Mathematica 7. Why would the two be so different?
>
> Kind Regards,
>
> Patch
>


-- 
DrMajorBob at yahoo.com

• Follow-Ups:
  • Re: Re: NDSolve Mathematica 6 and 7
    • From: David Szekely <D.Szekely@victorchang.edu.au>

• References:
  • NDSolve Mathematica 6 and 7
    • From: Mark Perrin <m.perrin@me.com>