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 Set fitting parameter bounds based on previous fit		  New Topic  Reply to Topic
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groggs

2 Posts
Posted - 10/23/2018 :  11:02:59 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hi,

Can I retrieve and set the bounds for peak fitting parameters in Labtalk?

For background, I need to batch fit some data (diffraction patterns), where each successive pattern is the evolution in time of some process. The signal is noisy, so I occasionally get incoherent fits. The idea is to fit one pattern (n) that's less prone to errors and then bound the fitting parameters of the next pattern (n+1) around the fitting parameters of n, then bound n+2 around n+1 etc.

I'm running OriginPro 2016 Sr2

Cheers!

yuki_wu

896 Posts
Posted - 10/23/2018 :  11:28:03 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi,

You could use nltree variable to control parameter values when you perform fitting by nlbegin X-Function. Please go through these pages for more info:
https://www.originlab.com/doc/LabTalk/Tutorials/Tutorial-Curve-Fitting-and-Batch-Processing-with-LT
https://www.originlab.com/doc/X-Function/ref/nlbegin

Regards,
Yuki

OriginLab
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groggs

2 Posts
Posted - 11/02/2018 :  10:41:50 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Yuki_Wu,

Thanks for your reply.
Actually I need to fit multiple (overlapping) peaks, so nlfit is not suitable. I normally run the Peak Analyser to fit multiple peaks, but using paMultiY I can't find info on how to get fit parameters (e.g. bounds) after each fit, or set parameters (e.g. bounds) before the next fit.
Any help appreciated!
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