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MathGroup Archive 2000

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Re: NDSolve Interpolating Function Range too small!

  • To: mathgroup at smc.vnet.net
  • Subject: [mg26369] Re: NDSolve Interpolating Function Range too small!
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Wed, 13 Dec 2000 02:41:27 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <914nhe$e4h@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

NDSolve[] print out some nice error messages, and it would be
helpful if you can can include it.

I expect that your equations do not evaluate to numbers at
the starting point or you are starting in
a singular point of the differential equation.

Regards
  Jens


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.


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