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 nonlinear fitting containing integral convergence		  New Topic  Reply to Topic
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memez

3 Posts
Posted - 05/23/2012 :  07:53:06 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): 8.6
Operating System: windows xp sp3

Hello everyone,
I origin 8.6 trial version because I needed to perform a tricky fit for my "advanced physycs lab" course.
The Aim is to find the 'A_d' and 'Theta_d' parameters (with the corresponding uncertainties) belonging to the following formula:



we have a complete set of 471 empirical data to match the rho_d (dipendent variable) and T.

We watched closely the tutorial on how to make a fitting function that included an integral using lab talk (http://www.originlab.com/www/helponline/origin/en/mergedProjects/Tutorial/Tutorial/Fitting_with_Integral_using_LabTalk_Function.html);

when we tried implementing it the program said that the integration variable (x) was not declared.
Then it could not even perform one iteration.

Obviously we couldn't do any fit.

Any guess why the function doesn't work?

memez

3 Posts
Posted - 05/23/2012 :  08:05:19 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
here are some pics from the process:
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Hideo Fujii

USA
1582 Posts
Posted - 05/23/2012 :  11:17:45 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi memez,

Since "x" is a reserved system variable in Origin, please try other variable name such as "xx". As far as I have just tried, it worked.

--Hideo Fujii
OriginLab
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memez

3 Posts
Posted - 05/28/2012 :  08:34:41 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
thank you very much!
With this little adjustment it finally worked properly!
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