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kikzzz

USA
2 Posts
Posted - 06/14/2015 :  5:09:51 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver: 9.1.
Service Release: b215
Operating System: windows 8 64-bit


I would like to use fitting function based on formula like this:



How can I do it right?

I tried define new nolinear fitting function:





As a result, I received an abnormal curve.

Where did I make a mistake?
Edited by - kikzzz on 06/14/2015 5:22:59 PM

jasonzhao

China
262 Posts
Posted - 06/14/2015 :  10:21:34 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hello,

The steps in graph above seems no problem.

After you setup your fitting function, you can use
http://www.originlab.com/doc/X-Function/ref/simcurve
Analysis: Fitting: Simulate Curve
to see and adjust the shape of curve, which helps you to find the initial value.

If the initial value for a b c d is not close to the final results, the fitting may not be well.

Besides, would you please make a image show the abnormal curve?

Best regards!
Jason
OriginLab Technical Service
Edited by - jasonzhao on 06/14/2015 10:22:40 PM
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