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mustangyhz

新虫 (初入文坛)

应助: 0 (幼儿园)
金币: 48
帖子: 23
在线: 12.1小时
虫号: 1189498
注册: 2011-01-14
专业: 集成电路设计与测试

[求助] 求助+电感参数提取+1stopt+曲线拟合

为何我用如下代码在1stopt中进行曲线拟合，始终不能达到很好的拟合效果（应该说效果很差），请高手赐教：

Title 拟合G+;
ComplexStr = i;
Parameter r1,r2,l2;
Variable x,y;
Function y=(r1*r2*(r1+r2)+2*3.1415926*x*l2*2*3.1415926*x*l2*r1)/((r1+r2)*(r1+r2)+2*3.1415926*x*l2*2*3.1415926*x*l2);

Data;
1.00E+08 1.13E+00
2.00E+08 1.13E+00
3.00E+08 1.14E+00
4.00E+08 1.16E+00
5.00E+08 1.18E+00
6.00E+08 1.20E+00
7.00E+08 1.23E+00
8.00E+08 1.25E+00
9.00E+08 1.28E+00
1.00E+09 1.31E+00
1.10E+09 1.33E+00
1.20E+09 1.36E+00
1.30E+09 1.38E+00
1.40E+09 1.41E+00
1.50E+09 1.43E+00
1.60E+09 1.45E+00
1.70E+09 1.47E+00
1.80E+09 1.48E+00
1.90E+09 1.50E+00
2.00E+09 1.51E+00
2.10E+09 1.52E+00
2.20E+09 1.53E+00
2.30E+09 1.53E+00
2.40E+09 1.54E+00
2.50E+09 1.54E+00
2.60E+09 1.54E+00
2.70E+09 1.53E+00
2.80E+09 1.53E+00
2.90E+09 1.52E+00
3.00E+09 1.52E+00
3.10E+09 1.51E+00
3.20E+09 1.50E+00
3.30E+09 1.48E+00
3.40E+09 1.47E+00
3.50E+09 1.45E+00
3.60E+09 1.43E+00
3.70E+09 1.41E+00
3.80E+09 1.39E+00
3.90E+09 1.37E+00
4.00E+09 1.35E+00
4.10E+09 1.32E+00
4.20E+09 1.29E+00
4.30E+09 1.27E+00
4.40E+09 1.24E+00
4.50E+09 1.20E+00
4.60E+09 1.17E+00
4.70E+09 1.14E+00
4.80E+09 1.10E+00
4.90E+09 1.06E+00
5.00E+09 1.02E+00
5.10E+09 9.84E-01
5.20E+09 9.41E-01
5.30E+09 8.98E-01
5.40E+09 8.52E-01
5.50E+09 8.05E-01
5.60E+09 7.57E-01
5.70E+09 7.06E-01
5.80E+09 6.54E-01
5.90E+09 6.01E-01
6.00E+09 5.45E-01
6.10E+09 4.88E-01
6.20E+09 4.28E-01
6.30E+09 3.67E-01
6.40E+09 3.04E-01
6.50E+09 2.39E-01
6.60E+09 1.72E-01
6.70E+09 1.03E-01
6.80E+09 3.11E-02
6.90E+09 -4.26E-02
7.00E+09 -1.19E-01
7.10E+09 -1.97E-01
7.20E+09 -2.77E-01
7.30E+09 -3.61E-01
7.40E+09 -4.46E-01
7.50E+09 -5.35E-01
7.60E+09 -6.26E-01
7.70E+09 -7.20E-01
7.80E+09 -8.17E-01
7.90E+09 -9.17E-01
8.00E+09 -1.02E+00
8.10E+09 -1.13E+00
8.20E+09 -1.23E+00
8.30E+09 -1.35E+00
8.40E+09 -1.46E+00
8.50E+09 -1.58E+00
8.60E+09 -1.71E+00
8.70E+09 -1.84E+00
8.80E+09 -1.97E+00
8.90E+09 -2.10E+00
9.00E+09 -2.24E+00
9.10E+09 -2.39E+00
9.20E+09 -2.54E+00
9.30E+09 -2.69E+00
9.40E+09 -2.85E+00
9.50E+09 -3.02E+00
9.60E+09 -3.19E+00
9.70E+09 -3.36E+00
9.80E+09 -3.54E+00
9.90E+09 -3.73E+00
1.00E+10 -3.93E+00
1.01E+10 -4.13E+00
1.02E+10 -4.33E+00
1.03E+10 -4.55E+00
1.04E+10 -4.77E+00
1.05E+10 -5.00E+00
1.06E+10 -5.24E+00
1.07E+10 -5.49E+00
1.08E+10 -5.74E+00
1.09E+10 -6.01E+00
1.10E+10 -6.28E+00
1.11E+10 -6.57E+00
1.12E+10 -6.86E+00
1.13E+10 -7.17E+00
1.14E+10 -7.49E+00
1.15E+10 -7.81E+00
1.16E+10 -8.16E+00
1.17E+10 -8.51E+00
1.18E+10 -8.88E+00
1.19E+10 -9.27E+00
1.20E+10 -9.67E+00
1.21E+10 -1.01E+01
1.22E+10 -1.05E+01
1.23E+10 -1.10E+01
1.24E+10 -1.14E+01
1.25E+10 -1.19E+01
1.26E+10 -1.24E+01
1.27E+10 -1.30E+01
1.28E+10 -1.35E+01
1.29E+10 -1.41E+01
1.30E+10 -1.47E+01
1.31E+10 -1.53E+01
1.32E+10 -1.60E+01
1.33E+10 -1.67E+01
1.34E+10 -1.74E+01
1.35E+10 -1.82E+01
1.36E+10 -1.89E+01
1.37E+10 -1.98E+01
1.38E+10 -2.06E+01
1.39E+10 -2.15E+01
1.40E+10 -2.25E+01
1.41E+10 -2.35E+01
1.42E+10 -2.46E+01
1.43E+10 -2.57E+01
1.44E+10 -2.68E+01
1.45E+10 -2.81E+01
1.46E+10 -2.94E+01
1.47E+10 -3.07E+01
1.48E+10 -3.22E+01
1.49E+10 -3.37E+01
1.50E+10 -3.53E+01
1.51E+10 -3.70E+01
1.52E+10 -3.89E+01
1.53E+10 -4.08E+01
1.54E+10 -4.28E+01
1.55E+10 -4.50E+01
1.56E+10 -4.73E+01
1.57E+10 -4.97E+01
1.58E+10 -5.23E+01
1.59E+10 -5.51E+01
1.60E+10 -5.81E+01
1.61E+10 -6.12E+01
1.62E+10 -6.46E+01
1.63E+10 -6.83E+01
1.64E+10 -7.22E+01
1.65E+10 -7.64E+01
1.66E+10 -8.09E+01
1.67E+10 -8.57E+01
1.68E+10 -9.09E+01
1.69E+10 -9.66E+01
1.70E+10 -1.03E+02
1.71E+10 -1.09E+02
1.72E+10 -1.16E+02
1.73E+10 -1.24E+02
1.74E+10 -1.33E+02
1.75E+10 -1.42E+02
1.76E+10 -1.52E+02
1.77E+10 -1.63E+02
1.78E+10 -1.75E+02
1.79E+10 -1.89E+02
1.80E+10 -2.03E+02
1.81E+10 -2.19E+02
1.82E+10 -2.37E+02
1.83E+10 -2.57E+02
1.84E+10 -2.78E+02
1.85E+10 -3.02E+02
1.86E+10 -3.28E+02
1.87E+10 -3.57E+02
1.88E+10 -3.90E+02
1.89E+10 -4.25E+02
1.90E+10 -4.64E+02
1.91E+10 -5.07E+02
1.92E+10 -5.53E+02
1.93E+10 -6.03E+02
1.94E+10 -6.57E+02
1.95E+10 -7.13E+02
1.96E+10 -7.71E+02
1.97E+10 -8.30E+02
1.98E+10 -8.86E+02
1.99E+10 -9.40E+02
2.00E+10 -9.86E+02
2.01E+10 -1.02E+03
2.02E+10 -1.05E+03
2.03E+10 -1.06E+03
2.04E+10 -1.06E+03
2.05E+10 -1.05E+03
2.06E+10 -1.02E+03
2.07E+10 -9.84E+02
2.08E+10 -9.39E+02
2.09E+10 -8.90E+02
2.10E+10 -8.37E+02
2.11E+10 -7.83E+02
2.12E+10 -7.30E+02
2.13E+10 -6.79E+02
2.14E+10 -6.31E+02
2.15E+10 -5.85E+02
2.16E+10 -5.42E+02
2.17E+10 -5.03E+02
2.18E+10 -4.67E+02
2.19E+10 -4.34E+02
2.20E+10 -4.04E+02
2.21E+10 -3.76E+02
2.22E+10 -3.51E+02
2.23E+10 -3.28E+02
2.24E+10 -3.07E+02
2.25E+10 -2.87E+02
2.26E+10 -2.70E+02
2.27E+10 -2.54E+02
2.28E+10 -2.39E+02
2.29E+10 -2.25E+02
2.30E+10 -2.13E+02
2.31E+10 -2.01E+02
2.32E+10 -1.91E+02
2.33E+10 -1.81E+02
2.34E+10 -1.72E+02
2.35E+10 -1.63E+02
2.36E+10 -1.56E+02
2.37E+10 -1.48E+02
2.38E+10 -1.42E+02
2.39E+10 -1.35E+02
2.40E+10 -1.29E+02
2.41E+10 -1.24E+02
2.42E+10 -1.19E+02
2.43E+10 -1.14E+02
2.44E+10 -1.09E+02
2.45E+10 -1.05E+02
2.46E+10 -1.01E+02
2.47E+10 -9.73E+01
2.48E+10 -9.37E+01
2.49E+10 -9.03E+01
2.50E+10 -8.71E+01
2.51E+10 -8.41E+01
2.52E+10 -8.13E+01
2.53E+10 -7.86E+01
2.54E+10 -7.60E+01
2.55E+10 -7.36E+01
2.56E+10 -7.12E+01
2.57E+10 -6.90E+01
2.58E+10 -6.69E+01
2.59E+10 -6.49E+01
2.60E+10 -6.30E+01
2.61E+10 -6.12E+01
2.62E+10 -5.95E+01
2.63E+10 -5.78E+01
2.64E+10 -5.62E+01
2.65E+10 -5.47E+01
2.66E+10 -5.33E+01
2.67E+10 -5.19E+01
2.68E+10 -5.05E+01
2.69E+10 -4.92E+01
2.70E+10 -4.80E+01
2.71E+10 -4.68E+01
2.72E+10 -4.57E+01
2.73E+10 -4.46E+01
2.74E+10 -4.35E+01
2.75E+10 -4.25E+01
2.76E+10 -4.15E+01
2.77E+10 -4.06E+01
2.78E+10 -3.97E+01
2.79E+10 -3.88E+01
2.80E+10 -3.80E+01
2.81E+10 -3.72E+01
2.82E+10 -3.64E+01
2.83E+10 -3.56E+01
2.84E+10 -3.49E+01
2.85E+10 -3.42E+01
2.86E+10 -3.35E+01
2.87E+10 -3.28E+01
2.88E+10 -3.22E+01
2.89E+10 -3.15E+01
2.90E+10 -3.09E+01
2.91E+10 -3.03E+01
2.92E+10 -2.98E+01
2.93E+10 -2.92E+01
2.94E+10 -2.87E+01
2.95E+10 -2.82E+01
2.96E+10 -2.77E+01
2.97E+10 -2.72E+01
2.98E+10 -2.67E+01
2.99E+10 -2.62E+01
3.00E+10 -2.58E+01

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1楼 2014-05-17 16:48:21

已阅回复此楼关注TA 给TA发消息送TA红花 TA的回帖

dingd

铁杆木虫 (职业作家)

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公式不合适吧？这种数据，3个参数？试试下面的公式：

y = 1/(p1+p2/x^0.5+p3*ln(x)/x)

均方差(RMSE):2.77029542411102
残差平方和(SSE):2302.36102105513
相关系数(R): 0.999952738282317
相关系数之平方(R^2): 0.999905478798304
确定系数(DC): 0.999866113104001
卡方系数(Chi-Square): -174.284872309803
F统计(F-Statistic): 439176.661473243

参数最佳估算
---------- -------------
p1 -1.08493929529663
p2 323386.405816884
p3 -1014172808.89368

c81.jpg

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2楼2014-05-17 22:39:21

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