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 nlsf with shared parameters		  New Topic  Reply to Topic
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basarir

USA
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Posted - 01/30/2007 :  11:54:39 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin):7 SR4
Operating System: Windows XP

Dear all,

Is there a way to fit two datasets to two different functions with shared parameters using the nlsf?

My functions are:

phi_real = (f_0^2-f^2)/ sqrt( (f_0^2-f^2)^2 + (f*f_0/Q)^2 )
phi_imag = -f*f_0 /Q / sqrt( (f_0^2-f^2)^2 + (f*f_0/Q)^2 )

where f is the same array for both of the datasets and phi_real and phi_imag are the dependent variables. f_0 and Q are the shared parameters. I can fit my data to each of these functions using NLSF independently but can I run NLSF simultaneously for both, such that I get one f_0 and one Q which are the best minimizations for both of the functions ?

Thank you,

Onur

zachary_origin

China
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Posted - 01/31/2007 :  03:09:42 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
You can define a function with phi_real, phi_image as Dependent Var and f, f_0,Q as Independent Var.

Then to do the fitting, select Action: Dataset to set the datasets for phi_real and phi_image properly.

Zachary
OriginLab Technical Services.
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basarir

USA
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Posted - 02/01/2007 :  09:18:45 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hello Zachary,

It worked!

Thank you,

Onur
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