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From: Neraux B. on 15 Oct 2009 12:39
I have a probleme with the curve fitting tool. I can not obtain a good fitting when I try to fit with a wiebe fonction.
I try to find double wiebe fonction on combustion data.
Please I need your help, it makes me crazy !

Thanks.
D.
From: Charbel on 16 Oct 2009 07:35
"Neraux B." <davy.bonnassies(a)hotmail.fr> wrote in message <hb7j7n$846$1(a)fred.mathworks.com>...
> I have a probleme with the curve fitting tool. I can not obtain a good fitting when I try to fit with a wiebe fonction.
> I try to find double wiebe fonction on combustion data.
> Please I need your help, it makes me crazy !
>
> Thanks.
> D.

Welcome to my World!
i'm trying to do the same, but i kind of succeded but i'm not sure if there's not a better function for my case.
i did lsqcurvefit function of Matlab.
Why do r u studying on double Wiebe equation? phD?
Gd Luck and best regards
From: Neraux B. on 21 Oct 2009 10:27
Thank you Charmel. Your function come from the optimization toolbox and I have the curve fitting toolbox.
I just want to know if your results are better with the optimization toolbox, because I can't have a real Wiebe function and for a good approximation I have to use Gauss function.
Thank you.
D.
From: Charbel on 21 Oct 2009 11:15
"Neraux B." <davy.bonnassies(a)hotmail.fr> wrote in message <hbn5no$6hc$1(a)fred.mathworks.com>...
> Thank you Charmel. Your function come from the optimization toolbox and I have the curve fitting toolbox.
> I just want to know if your results are better with the optimization toolbox, because I can't have a real Wiebe function and for a good approximation I have to use Gauss function.
> Thank you.
> D.

I didn't get your question, but i use the lsqcurvefit, and it fit just fine.
But u'll face a problem with the initial x0 that you'll need to fix before the iterations.
and it depends on the model that you are studying ( how many parameters u're trying to find and how many did u fixed)

Best regards.
Charbel
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