From help-request at octave dot org Tue Jan 11 08:48:49 2005
Subject: Re: ODE system solving
From: Geraint Paul Bevan <g dot bevan at eng dot gla dot ac dot uk>
To: "homer_jay at katamail dot com" <homer_jay@katamail.com>
CC: help at octave dot org
Date: Tue, 11 Jan 2005 14:43:38 +0000

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homer_jay at katamail dot com wrote:
| i found this for solving a BVP problem:
|
| you have a condition like this:
| equations
| y(0)=2
| y(L)=4
|
| Using ODE function, you can't do this, but you have to write something
like this:
|
| equations
| y(0)=2
| Y'(0)=alfa
|
| then you write this new equation: F(alfa)=y(L)-4
|
| and you need to find alfa for wich F(alfa)=0 (so y(L)=4)
|
| my question is: how to solve this equation? can i use something like
the MATLAB's "fzero" function? (i think it's ok in matlab, but i don't
konw really)

Have a look at the Differential-Algebraic Equations and Nonlinear
equations sections in the manual - you should be able to use daspk to
solve the equations for a given alfa. Perhaps you could then wrap the
entire integration loop within another function that you pass to fsolve.

- --
Geraint Bevan
http://www.mech.gla.ac.uk/~gbevan

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