Stiff ODEs?

[John W. Eaton]

On 23-Apr-2004, Ross Vandegrift <address@hidden> wrote:

|       Matlab has a function, ode15s, that is very useful for getting
| solutions to stiff ODEs (functions with rapidly decaying transients).
| Octave is missing this function, and I have a project coming up that
| will study stiff ODEs.
| 
|       Has anyone already implemented ode15s?  How about a stiff DE
| solver?  A search on google mostly turned up lists of functions Octave
| is missing.

Did you think to look in the section of the Octave manual that covers
differential equations?  There you would find the documentation for a
fairly complete interface for LSODE, which has a stiff solver option
and can take advantage of a user-supplied Jacobian or, if it is not
supplied, compute that information using finite differences.

jwe



-------------------------------------------------------------
Octave is freely available under the terms of the GNU GPL.

Octave's home on the web:  http://www.octave.org
How to fund new projects:  http://www.octave.org/funding.html
Subscription information:  http://www.octave.org/archive.html
-------------------------------------------------------------