Curve Fitting Problem

[Sergei Steshenko]

Applications From Scratch: http://appsfromscratch.berlios.de/


--- On Thu, 6/26/08, A. Kalten <akalten at comcast.net> wrote:

> From: A. Kalten <akalten at comcast.net>
> Subject: Re: Curve Fitting Problem
> To: help-octave at octave.org
> Date: Thursday, June 26, 2008, 9:37 PM
> On Thu, 26 Jun 2008 19:52:32 -0700 (PDT)
> Sergei Steshenko <sergstesh at yahoo.com> wrote:
> 
> > 
> > If I understand your problem correctly, is more or
> less like this;
> > 
> > 1) there is f(x) to be approximated;
> > 2) the desired approximation is:
> > 
> > a * x^2 + b * x + c;
> > 
> 
> In this case there is no function to be approximated. 
> There
> is only data that fits a theoretical model.  I was
> inquiring
> about any off-the-shelf algorithms that can fit a function
> to a data set where some of the parameters of the function
> need to be constrained in a certain way.
> 
> AK
> 

When I said "function to be approximated" I meant tabular function,
so if you have tabular f(x) for a set of given xs, you can as well
approximate

f(x) - a * x ^ 2

for the same set of given xs.

Regards,
  Sergei.