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 非线性函数拟合

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T O P I C    R E V I E W
RUIXUAN0955 Posted - 06/01/2017 : 09:02:46 AM
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
4   L A T E S T    R E P L I E S    (Newest First)
cc261 Posted - 06/16/2017 : 05:22:07 AM
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
Echo_Chu Posted - 06/16/2017 : 04:11:59 AM
是的,通常建议需要拟合的数据点比拟合函数的参数要多
RUIXUAN0955 Posted - 06/12/2017 : 04:02:46 AM
非线性拟合中,Standard Erro它是怎么计算的呢?

Value Standard Error
a 0.28907 0.00342
Echo_Chu Posted - 06/06/2017 : 11:28:49 PM
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

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