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 Extrapolating a parabolic function		  New Topic  Reply to Topic
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Jason Deacon

Canada
12 Posts
Posted - 10/22/2020 :  5:17:00 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hey guys,

I'm using OriginPro 2020b (64-bit) 9.7.5.184

I'm trying to fit a what-should-be-a parabolic relationship by using half of the parabola in the data. On the left is my attempt and on the right is my desired result (I'm trying to obtain the Z' values at the x-intercepts, where one is known and the other is extrapolated).




Best wishes,

Echo_Chu

China
Posts
Posted - 10/22/2020 :  10:40:54 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi, Jason

First, you can select a range on curve and then fit with Parabola function. Please look at the video below for how to do it.
https://www.originlab.com/videos/details.aspx?id=263

Once you fit the data range, you can manully set the range of fitted curve in the NLFit dialog



Echo
OriginLab Technical Support
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