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Re: ODE Stiff Systems

• To: mathgroup at smc.vnet.net
• Subject: [mg106385] Re: ODE Stiff Systems
• From: dh <dh at metrohm.com>
• Date: Mon, 11 Jan 2010 05:30:24 -0500 (EST)
• References: <hic376$5dc$1@smc.vnet.net>

Hi,

the message means that the at some place the solution is changing very 

rapidly compared to the rest of the integration range. You may e.g. 

split the integration range into several intervalls. You may also try 

the option: "StiffnessSwitching".

Anyway, it always helps if you give a simple example.

Daniel



MacDonald, Calum (MAT) wrote:

> I am trying to solve an ODE numerically using NDSolve but get a message

> 

> " step size is effectively zero; singularity or stiff system suspected."

> 

> Can anyone please suggest an otion I can use along with 'Method' to attempt to overcome the problem?

> 

> I have tried Method -> "ExplicitRungeKutta" and it doesn't work.  What other options are available?

> 

> Thanks for any help.

> 

> 

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