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 how to draw the fitting curve?		  New Topic  Reply to Topic
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xiaoliang

Ivory Coast
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Posted - 04/12/2007 :  07:16:59 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): originpro 7.5
Operating System:windows XP
I only can draw scatters with my datas,but I want to use my datas to draw the fitting curve in origin 7.5, I do not know how to do,please help me?
my datas:X: 0 0.0001 0.001 0.01 0.1 1 10 100 500
Y:10.404 9.518 9.175 8.414 7.603 4.588 0.401 0.401 0.037


Thank you!


Edited by - xiaoliang on 04/12/2007 07:21:26 AM

guokeno1

Algeria
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Posted - 04/12/2007 :  07:26:10 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
you can find an answer in
http://pspper.xkwm.cn/main.htm
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larry_lan

China
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Posted - 04/12/2007 :  08:25:00 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hi xiaoliang:

Firstly, I think you need to decide what kind of model you want to fit. Base on your data, I guess maybe you can use logarithm X coordinate (Double click the axis and select Log10 type under Sclae tab) and fit a sigmoidal curve. Please read:

Analysis: Curve Fitting > Nonlinear Curve Fitting from the Menu > Sigmoidal > Using the Sigmoidal Fit Tool

of Origin Help for more information.


This guokeno1 guy used to posted AD here, can we remove it?

Hi Everyone:

Please DO NOT click the upper link!

Larry
OriginLab Technical Services

Edited by - larry_lan on 04/12/2007 08:49:21 AM
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