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 algorithm for finding minimum difference		  New Topic  Reply to Topic
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hofmannt

USA
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Posted - 03/26/2012 :  12:12:08 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin): 8 SR4
Operating System: Windows 7 Professional 64-bit

Here's what I'm trying to do:
I have a spectrum X that is a superposition of three individual spectra A, B, C. I'm trying to find the fractions a,b,c that minimize X-a*A-b*B-c*C. What would be the best way to program this?
The spectra share the same x-Axis and the y-axis values are normalized, i.e. 0 to 1.

Thanks!

Sam Fang

293 Posts
Posted - 03/28/2012 :  03:58:43 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
You can select Analysis: Fitting: Multiple Linear Regression from Origin menu. And choose Fix Intercept in the Fit Options branch.

Sam
OriginLab Technical Services
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