| T O P I C R E V I E W |
| Luke11 |
Posted - 05/13/2016 : 4:13:46 PM
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! |
| 1 L A T E S T R E P L I E S (Newest First) |
| Echo_Chu |
Posted - 05/16/2016 : 06:22:08 AM
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.
|
|
|
