Curve Fitting Problem

[A. Kalten]

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