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Khosrove

Latvia
12 Posts
Posted - 03/21/2016 :  11:48:28 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hello,

I want to fit the Boltzmann function to a dataset, without any specific parameters set.
Here is what I have tried, but it just creates a graph of the dataset and a workbook with x values and "10" in every single cell of the fit column.
What am I doing wrong here?

nlsf.func$ = Boltzmann; // select Boltzmann fitting function
nlsf.fitdata$ = Book2_HH@9; // define dataset to be fitted ;
nlsf.fit(100); // iterate 100 times

Hideo Fujii

USA
1582 Posts
Posted - 03/21/2016 :  1:38:49 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Khosrove,

nlsf objects are obsolete, and you should use NLFit x-functions like:
nlbegin iy:=[Book2]9!col(HH) func:=Boltzmann;
nlfit;
nlend 1;
See details in http://www.originlab.com/doc/X-Function/ref/nlbegin .

Hope this helps.

--Hideo Fujii
OriginLab
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Khosrove

Latvia
12 Posts
Posted - 03/21/2016 :  2:22:37 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hello Hideo Fujii,

I have OriginPro 8 SR4, sorry for not mentioning that earlier.
I tried your script, but in return I get:

general operation failure
general operation failure
general operation failure
general operation failure
Internal error code: -898, -28673

#Command Error!
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Hideo Fujii

USA
1582 Posts
Posted - 03/21/2016 :  3:39:10 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Khosrove,

Sorry, but I cannot reproduce the problem because I don't have Origin 8 on my machine. You got the error probably because of the version compatibility. As far as I tried Origin 8.1, it worked.
If you just need to get the fitting result, you can try the evaluation version of Origin 2016.
http://www.originlab.com/demodownload.aspx

--Hideo Fujii
OriginLab
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Khosrove

Latvia
12 Posts
Posted - 03/22/2016 :  09:13:53 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thank you for your answers Hideo Fujii.

I got it to work in the end by setting the parameters.

nlsf.func$ = Boltzmann; // select Boltzmann fitting function
nlsf.fitdata1$ = [Book2]Sheet7!col(3); // define dataset to be fitted ;
nlsf.p1 = 701; // A1 of first dataset
nlsf.p2 = 106475; // A2 of first dataset
nlsf.p3 = 827.25523; // x0 of first dataset
nlsf.p4 = 28.4254; // dx of first dataset
nlsf.fit(100); // iterate 100 times
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