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Solving the Debye integral with origin 8.0

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T O P I C R E V I E W
Squall Leonhart	Posted - 09/24/2009 : 08:49:56 AM 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!
4 L A T E S T R E P L I E S (Newest First)
larry_lan	Posted - 09/26/2009 : 9:39:31 PM 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
Squall Leonhart	Posted - 09/25/2009 : 07:04:00 AM 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.
cpyang	Posted - 09/24/2009 : 6:05:15 PM 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
Squall Leonhart	Posted - 09/24/2009 : 2:20:07 PM 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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