The Origin Forum
File Exchange
Try Origin for Free
The Origin Forum
Home | Profile | Register | Active Topics | Members | Search | FAQ | Send File to Tech support
Username:
 Password:
Save Password
Forgot your Password? | Admin Options

 All Forums
 Origin中文论坛
 Origin 中文论坛 (Chinese Origin Forum)
 非线性函数拟合		  New Topic  Reply to Topic
 Printer Friendly
Author Previous Topic Topic Next Topic Lock Topic Edit Topic Delete Topic New Topic Reply to Topic

RUIXUAN0955

China
4 Posts
Posted - 06/01/2017 :  09:02:46 AM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
我有一组数据，如何用origin拟合？大神帮忙！


0.131 0.01
0.291 0.02
0.385 0.03
0.45 0.04
0.47 0.05

拟合函数是y =a/(x^2)+b*x^2+c+d/x+e*x

Echo_Chu

China
Posts
Posted - 06/06/2017 :  11:28:49 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
这需要自定义函数进行拟合, 你可以看下面的教程学习怎样在Origin中自定义函数并进行拟合

http://www.originlab.com/doc/Tutorials/UserDef-FitFunc

但需要指出一下， 现在你的数据点的数量跟你你的拟合方程里面的参数数据差不多， 通常这种情况下的拟合很难有效
Go to Top of Page

RUIXUAN0955

China
4 Posts
Posted - 06/12/2017 :  04:02:46 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
非线性拟合中，Standard Erro它是怎么计算的呢？

Value Standard Error
a 0.28907 0.00342
Edited by - RUIXUAN0955 on 07/02/2017 10:09:36 PM
Go to Top of Page

Echo_Chu

China
Posts
Posted - 06/16/2017 :  04:11:59 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
是的，通常建议需要拟合的数据点比拟合函数的参数要多
Go to Top of Page

cc261

22 Posts
Posted - 06/16/2017 :  05:22:07 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
1#的数据量长度和参数个数相同，有唯一稳定解：

a 0.0902610555641516
b 14.0168233233529
c 7.7484447289012
d -1.43681890025767
e -17.3325648225397
Go to Top of Page
  Previous Topic Topic Next Topic Lock Topic Edit Topic Delete Topic New Topic Reply to Topic
 New Topic  Reply to Topic
 Printer Friendly
Jump To:
The Origin Forum © 2020 Originlab Corporation Go To Top Of Page
Snitz Forums 2000