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Re: Trouble with fsolve

From: David Bateman
Subject: Re: Trouble with fsolve
Date: Wed, 19 Oct 2005 15:48:49 +0200
User-agent: Mozilla Thunderbird 0.8 (X11/20040923)

Joel Konkle-Parker wrote:

On Tue, 2005-10-18 at 17:17 +0200, David Bateman wrote:
together with the explanation of why this is the wrong way to go.. Note that the changes to "quad" were made. However daspk, dasrt, dassl, fsolve, lsode and odessa weren't converted as the resulting code is an ugly hack. The only real solution is to completely dump the existing mess for these functions and reimplement it removing the underlying fortran code.... So a workaround with global variables is the only way this can be done at the moment in octave..

Have you guys looked at SciPy for an example? Their fsolve function lets
you include multiple parameters, and according to them, it's just a
simple wrapper around MINPACK.

Octave also uses minpack for fsolve. The issue I had was not one of multiple arguments per-se, but how to define a single function in the same manner as matlab that returns both the function evaluations and the jacobian. The underlying fortran code wants two seperate functions. Given permission to be completely matlab incompatiable and allow multiple argument function handles to be passed to fsolve, etc and force the user to define the function and its jacobian seperately then yes something can be done. If you want a completely matlab compatiable fsolve that calculates the function and the jacobian in a single function, without the mess of caching the results, then you have to rewrite the underlying fortran code to accept this...


David Bateman                                address@hidden
Motorola Labs - Paris +33 1 69 35 48 04 (Ph) Parc Les Algorithmes, Commune de St Aubin +33 1 69 35 77 01 (Fax) 91193 Gif-Sur-Yvette FRANCE

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