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Re: NDSolve Interpolating Function Range too small!

• To: mathgroup at smc.vnet.net
• Subject: [mg26351] Re: [mg26344] NDSolve Interpolating Function Range too small!
• From: Reza Malek-Madani <research at usna.edu>
• Date: Wed, 13 Dec 2000 02:41:13 -0500 (EST)
• Sender: owner-wri-mathgroup at wolfram.com

I would imagine you are hitting a singularity at 10^(-30) if Mathematica
is not giving you other warnings. If you send me the equations, I would be
happy to play with them and report back what I find. Reza.   



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Reza Malek-Madani               Director of Research
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On Tue, 12 Dec 2000 flashboltzmann at my-deja.com wrote:

> I'm using NDSolve to numerically solve three very complicated second
> order differential equation. When NDSolve does the calculation though
> the interpolating function always has a range in the 10^-30 something
> range. This is useless when I try to plot the solutions to the equation
> because I need it on a range of up to 100. How do I tweak mathematica
> (or my equation) to get a decent range from the interpolating function?
> Also, when I am plotting is there any way to tell mathematica not to
> extrapolate a solution if it hits an undefined point?
> 
> 
> Sent via Deja.com http://www.deja.com/
> Before you buy.
> 
>