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一组最优化的方程式中的最小平方q (平)
原标题:Least squares in a set of equations with optimize.leastsq() (Python)

我有两个职能和一套数据。 这两项职能都有相同的X数据和相同的参数。 我想以最符合我数据的最佳方法获得参数。

The parameters are: ex,ey,ez.

X数据为:RA,DE(相当于3,000分)。

The Y data are: dRA,dDE.

我试图这样做,但我获得了错误的解决办法:

def residuals(p, dRA, dDE, RA, DEC):
    ex,ey,ez = p
    f1 = dRA-(ex*sin(DEC)*cos(RA)+ey*sin(DEC)*sin(RA)-ez*cos(DEC))
    f2 = dDE-(-ex*sin(RA)+ey*cos(RA))
    err = np.concatenate((f1,f2))
    return err

from scipy.optimize import leastsq
p0 = [0, 0., 0.]
plsq_coord = leastsq(residuals, p0, args=(dRA, dDE, RA, DE))
print plsq_coord[0] 

任何类型的帮助都非常好。

最佳回答

如该测试守则所示

import numpy as np, numpy.random,scipy.optimize
def residuals(p, dRA, dDE, RA, DEC):
    ex,ey,ez = p
    f1 = dRA-(ex*np.sin(DEC)*np.cos(RA)+ey*np.sin(DEC)*np.sin(RA)-ez*np.cos(DEC))
    f2 = dDE-(-ex*np.sin(RA)+ey*np.cos(RA))
    err = np.concatenate((f1,f2))
    return err    
ex, ey, ez = 0.2, 0.3, 0.4
N = 100
err = 1e-3
ra, dec = np.random.uniform(0,1,N), np.random.uniform(0,.5,N)
dra = (ex*np.sin(dec)*np.cos(ra)+ey*np.sin(dec)*np.sin(ra)-ez*np.cos(dec))+np.random.normal(size=N)*err
ddec = (-ex*np.sin(ra)+ey*np.cos(ra))+np.random.normal(size=N)*err
print scipy.optimize.leastsq(residuals, p0, args=(dra, ddec, ra, dec))

您的法典应当细致,除非你的职能被错误地写成(例如你的ra、dec学位、而不是rad),否则你在数据集中有一些错误的数据点,而数据集则显示了 fit。

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