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 Fitting with integral

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T O P I C    R E V I E W
Tucko Posted - 02/11/2020 : 11:39:37 AM
Hello,
I have a set of data (x,y) and I would like to fit this curve using the following function :

y=a+(b-a){1-exp[-(integral(MyIntegral,LowerLimit=0,UpperLimit=x)]}

with

MyIntegral=dx/(A*exp[B/c+C/D(x)]]
D(x)=y^(-1/e)

here A,B,C are fitting parameters and a,b,c,e are constants.

I have been trying the fitting function builder and the inclusion of integration during fitting but I do not get a good result.
Thanks for your help
2   L A T E S T    R E P L I E S    (Newest First)
Tucko Posted - 02/19/2020 : 08:27:38 AM
Hi James,

thank you very much for your answer. The fitting procedure is now on point thanks to your advice.

Clément
YimingChen Posted - 02/11/2020 : 3:05:44 PM
Hi,

Please first refer to this page:
https://www.originlab.com/doc/Tutorials/Fitting-Integral-LabTalk

See below figures for some of the settings for your case:





James

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