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 Curve fitting Data and function correlation		  New Topic  Reply to Topic
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johnvl

Canada
2 Posts
Posted - 05/29/2015 :  1:10:22 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Ver. and Service Release (Select Help-->About Origin):
Operating System:
Hello
I have a set of data and i want to find the best fitting function that correlates them(that with the least error).Can anyone suggest me a way to do that?(I think langrangian interpolation is a way but i cant find how it works on origin)Note:the curve fitting option options such as Gaussian is not sufficient.The data set is:1 2.1806
1 2.2159
1 2.5
1.1 3.8397
1.1323 3.9568
1.3169 4.0148
1.3169 4.0452
1.34 4.0722
1.36 4.1847
1.37 4.1864
1.4399 4.1397
1.53 4.1859
1.67 4.1866

ddc

lkb0221

China
497 Posts
Posted - 05/29/2015 :  1:54:08 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
See this:
http://www.originlab.com/doc/Origin-Help/fitrank-multi-func
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johnvl

Canada
2 Posts
Posted - 05/31/2015 :  6:16:01 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
I cant find the funcRank.I have OriginPro 9


ddc
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jasonzhao

China
262 Posts
Posted - 06/01/2015 :  02:54:19 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Hello,

You mentioned that 'langrangian interpolation' which should be a kind of polynomial interpolation, and you also point out that a fitting is need, so why not try the Poly_n function in Analysis: Fitting: Nonlinear Fit: Polynomial Category, a 5 order polynomial could be tried first.
http://www.originlab.com/doc/Origin-Help/Poly5-FitFunc

Best regards!
Jason
OriginLab Technical Service
Edited by - jasonzhao on 06/01/2015 02:57:33 AM
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