python计算平面的法向-利用协方差矩阵求解特征值和特征向量

Obvious，最小特征值对应的特征向量为平面的法向

Created on Sun Nov 05 19:37:26 2017

@author: Bambo
"""

import numpy as np
import scipy

x=[random.randint(0,100) for i in range(40)]
y=[random.randint(0,100) for i in range(40)]
z=[a*3+b*2+1 for a,b in zip(x,y)]

r=map(list,zip(x,y,z))
k=mat(r)
re=k.T*k

e,v=scipy.linalg.eigh(re,turbo=False,eigvals=(0,0))
#e,v=scipy.linalg.eigh(re,eigvals=(a,b))

print e
print v