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 Solving the Debye integral with origin 8.0		  New Topic  Reply to Topic
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Squall Leonhart

Italy
3 Posts
Posted - 09/24/2009 :  08:49:56 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): 8.0
Operating System: win xp

Hi everyone.
I'm an italian student at the physical engineering faculty in Politecnico, Turin.
I'm working on a way to fit a non linear set of data.
The function I have to build is the resistivity Debye model:
http://img34.imageshack.us/img34/1657/debyemodel.jpg
,
where rho is resistivity and T stands for temperature.
As you can image, the problem is the integral.
May you help me creating this function?
Once i have a correct function, i'll be able to fit the data I mesured and determine the values of the costants tetad and Ad.
Thanks a lot!

Squall Leonhart

Italy
3 Posts
Posted - 09/24/2009 :  2:20:07 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Please, I'm really in a trouble for this function...
I have to give my work to the professor tomorrow in the morning!
HELP!
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cpyang

USA
1406 Posts
Posted - 09/24/2009 :  6:05:15 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
You should first look at these examples:

http://qhwiki.originlab.com/~originla/howto/index.php?title=Tutorial:Fitting_with_Integral_using_NAG_Library

http://qhwiki.originlab.com/~originla/howto/index.php?title=Tutorial:Fitting_Integral_Function_with_parametric_limit_using_NAG_Library

http://qhwiki.originlab.com/~originla/howto/index.php?title=Tutorial:User_Defined_Fitting_Funciton_using_GNU_Scientific_Library


CP
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Squall Leonhart

Italy
3 Posts
Posted - 09/25/2009 :  07:04:00 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thanks for replying.
Anyway, I didn't succeed in solving my problem even after consulting your suggested links.
May someone help me creating the appropriate code?

N.b.
I never used Origin before, and even if I know the C programming language I still can't create a program that solves integrals.
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larry_lan

China
Posts
Posted - 09/26/2009 :  9:39:31 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi:

You should give us more information, or we have no idea how to fix your problem. You said you can't create an Origin C fitting function. So, did you get any error message when you compiled? Or you just cannot make the curve converged?

Thanks
Larry
OriginLab Technical Services
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