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 Curve fitting of complex curve		  New Topic  Reply to Topic
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cmbasak

USA
3 Posts
Posted - 12/18/2021 :  11:56:57 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Curve fitting of this complex curve below

https://ibb.co/XXqmtPf

I think it would be easier to have two separate polynomials like this below.
https://ibb.co/KGn2SWS
Can I use origin for curve fitting how?

Chims

yuki_wu

896 Posts
Posted - 12/20/2021 :  01:44:43 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Chims,

I think this tutorial is what you are looking for:
https://www.originlab.com/doc/Tutorials/Fitting-Piecewise

Regards, Yuki
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YimingChen

1608 Posts
Posted - 12/20/2021 :  09:45:41 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi Chims,

You may need to manually split your data into sections. See the figure below. With the graph activated, you can select the Data Highlighter tool on the left hand side toolbar, highlight the upper section of the curve, then click the Create Subset Sheet button to extract the data to a new sheet. Repeat this with the lower section of the curve. Then you should be able to run polynomial fit on each dataset.


James
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