From maintainers-request at octave dot org Thu Mar 30 09:10:37 2006
Subject: Re: Bi variate to mono variate functions
From: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>
To: David dot Bateman at motorola dot com
Cc: Anglade Pierre-Matthieu <anglade at gmail dot com>, maintainers@octave.org
Date: Thu, 30 Mar 2006 10:10:25 -0500

On 30-Mar-2006, David Bateman wrote:

| I have R14sp3 installed, which I believe is the latest version as it is
| dated Feb 13, 2006. So I don't think it is fixed...

Strange.  Here is what I see with the version installed on the UW COE
systems (Version 7.1.0.183 (R14) Service Pack 3, August 02, 2005):

  >> type myfun2

  function y = myfun2(x,c)
	 y = 1./(x.^3-2*x-c);

  >> p = 5

  p =

       5

  >> quad ( at (x) myfun2 (x, p), 0, 2)

  ans =

     -0.4605


Also, this type of behavior is documented for fsolve:

  >> help fsolve
   FSOLVE solves systems of nonlinear equations of several variables.

      [...]

      To solve the system of equations for a specific value of c, first assign the    value to c. Then create a one-argument anonymous function that captures
      that value of c and calls myfun with two arguments. Finally, pass this anonymous
      function to FSOLVE:

	  c = -1; % define parameter first
	  x = fsolve( at (x) myfun(x,c),[-5;-5])

      See also OPTIMSET, LSQNONLIN,  at , INLINE.


jwe