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Re: Nonlinear equation

From: Lorenzo Fiorentini
Subject: Re: Nonlinear equation
Date: Fri, 18 Apr 2003 10:35:09 +0200

Of course fsolve works without need of a derivative function; 
this simply means that it does not implement, strictly 
speaking, the Newton's method, which by definition needs it.

As far as I can see here:
fsolve uses a Powell hybrid method which relies on a finite 
difference estimation for calculating a numerical jacobian.


Il 16/04/2003 14.42.00, Heber Farnsworth 
<address@hidden> ha scritto:

>I think you may be confused.  Fsolve implements Newton's 
method (with a 
>dogleg search as I recall) and it does not need you to 
calculate an 
>analytic derivative.

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