[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
## Re: backward ODE solving

**From**: |
Ben Diedrich |

**Subject**: |
Re: backward ODE solving |

**Date**: |
Mon, 26 Apr 2004 13:19:03 -0400 |

The ODE solver is called within a gradient optimization function that can
see a wide variety of problems. The current configuration uses the timesteps
selected by 'ode23' (either Matlab or octave-forge). If lsode could output
the internally selected timesteps, the behavior would be the same. I'm not
certain what impact pre-selected timesteps would have on the behavior of the
algorithm for different problems. I can try it out, though.
Ben
"John W. Eaton" wrote:
>* On 26-Apr-2004, Ben Diedrich <address@hidden> wrote:*
>
>* | I haven't tried 'lsode' yet, but I'd prefer to use a solver*
>* | that calculates the output time vector, instead of requiring one ahead*
>* | of time as lsode does.*
>
>* Why? The times you specify for lsode are the times for which you want*
>* to see the solution. Internally, it selects whatever timesteps are*
>* necessary to satisfy the local error tolerances that you specify for*
>* the solution.*
>
>* 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*
>* -------------------------------------------------------------*
-------------------------------------------------------------
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
-------------------------------------------------------------