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 Polynomial fitting with monotonical increase

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T O P I C    R E V I E W
Ninine Posted - 12/11/2021 : 05:06:24 AM
Origin Ver. and Service Release (Select Help-->About Origin):
Operating System:

Hi all,

I want to fit a 9th order polynomial to the data which should be monotonical within a given range. So there should be no local maximum in the fitted curve. I don't really care how the curve looks like out of that range.
The default fitting option gives the curve below. Is there any simple way to constrain the fitting?

Thanks!!
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yuki_wu Posted - 12/12/2021 : 10:09:14 PM
Hi,

Please take a look at this page:
https://www.originlab.com/doc/Origin-Help/FitPara-Bound-Contraint

Regards, Yuki

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