Curve Fitting Problem

[Ben Abbott]

On Jun 26, 2008, at 9:52 PM, A. Kalten wrote:

> On Thu, 26 Jun 2008 21:14:12 -0400
> Ben Abbott <bpabbott at mac.com> wrote:
>
>>
>> On first inspection, it appears your example has non-linear  
>> constraints.
>>
>> Is this example the specific problem you'd like to solve, or are you
>> looking for something a general solution?
>>
>
> This is a specific problem, but there are/will be others of a similar
> nature.
>
> I am asking if there are off-the-shelf curve-fitting algorithms,
> maybe for octave, that will allow constraints on some of the  
> parameters,
> or is custom programming the only way to go.
>
> AK

If the constraints are linear, then a general solution is possible. In  
fact there is a free version available for Matlab (although I don't  
know what sort of license is involved).

If the constraints are non-linear (as in your example) then the  
difficulty of a solution will depend upon whether or not the variables  
are pure real or complex valued.

Ben