From owner-help-octave at bevo dot che dot wisc dot edu  Tue Nov 28 19:03:42 1995
Subject: fsolve and fsolve_options
From: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>
To: Heber Farnsworth <heberf at u dot washington dot edu>
cc: help-octave at bevo dot che dot wisc dot edu
Date: Tue, 28 Nov 1995 19:03:41 -0600

Heber Farnsworth <heberf at u dot washington dot edu> wrote:

: I have two questions that don't seem well documented.  First, what
: sort of algorithm is fsolve using?  I read that it comes from hybrid
: in MINPACK but I'm not familiar with that.  I'm finding that it's
: giving me different answers than one that I wrote (mine is better it
: seems) and I want to know why?

The source for hybrd is distributed with Octave.  All of Minpack is
available via netlib:

  http://www.netlib.org/

: Second what are the options that can be adjusted with
: fsolve_options?  I know that tolerance can be changes but I can't
: tell what others may or may not be.

Currently, the only thing you can specify for fsolve is the tolerance.

I would like to have a better method for solving nonlinear equations.
If someone knows of something that works better than the old Minapck
routines and that can be freely redistributed, please let me know.

Thanks,

jwe