From help-octave-request at bevo dot che dot wisc dot edu Sun Jan 13 10:06:41 2002
Subject: Re:  fzero and fmins
From: Etienne Grossmann <etienne at damiao dot isr dot ist dot utl dot pt>
To: help-octave at bevo dot che dot wisc dot edu, rene.rebe@gmx.net
CC: etienne at isr dot ist dot utl dot pt
Date: Sun, 13 Jan 2002 16:11:05 +0000


  Hello,

From: Rene Rebe <rene dot rebe at gmx dot net>
 
# Hi.
# 
# I just started to use octave (because of Matlab in the university ...)
# - so some very stupid first try question:
# 
# I'm missing the fzero and fmin function (when I remember right fmin
# got renamed to fminsearch in newer Matlab versions ...). Is there some
# nearly equvalent replacement for them in octave?

  There is no fmin, but I wrote a few minimization functions, which,
until I upload them to octave-forge (*) (http://octave.sf.net), you
can find at :

  http://www.isr.ist.utl.pt/~etienne/octave/uc_optim-2001.07.16.tar.gz
  
The functions I provide are for unconstrained minimization : 

    Without derivatives : Nelder-Mead (function "nelder_mead_min").
    With first derivatives : Conjugate Gradient (function "cg_min").
    With first and second derivatives : Newton-like method (function "d2_min").
    A wrapper for the three functions above : the "minimize" function.

  As you can see, none is really like fmins, but they will minimize in
multidimensional spaces.

  Hth,

  Etienne


(*) octave-forge has a 'fmin' function.



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