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 Fit using a digitized function		  New Topic  Reply to Topic
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Luke11

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Posted - 05/13/2016 :  4:13:46 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release 9.1 b215:
Operating System: Windows 10

Hi, everyone! Here's my problem:
I have to execute a 2 parameter fit of some experimental data about a measure of resistivity. The formula I'm using is:

rho(T)=rho0+T*A*integral(dOmega (F(Omega)*g(T,Omega)))
(A and rho0 are the parameters to fit, T is the independent variable)

g contains elementary functions (sinh(T) and T), while the only way to obtain F(Omega) is to digitize a graph that I found on some academic article, which I did.
My question now is: is it there a way to call the digitized data from the fitting function builder in order to use it in the fit?
Thanks in advance for the help!

Echo_Chu

China
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Posted - 05/16/2016 :  06:22:08 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

You can interpolate the digitized data to get the F(x) value on Omega. We have a labtalk function, interp, to do this. You can also look at the page below for more details on using the function.

http://www.originlab.com/doc/LabTalk/ref/Interp-func

That is, you can call the function when you define the user-defined function. Please learn more details on define an integral function with Labtalk in Origin.

http://www.originlab.com/doc/Tutorials/Fitting-Integral-LabTalk

Echo
OriginLab Tech.
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