import numpy as np
if __name__ == '__main__':
a = np.array([[1,2,3],[3,1,1]])
c_ = np.mean(a, axis =0) #按列计算
x = a - c_ # 广播机制
cov = x.T.dot(x)/(a.shape[0]-1) #协方差
print(cov)
协方差实现(python)
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转载自blog.csdn.net/weixin_38527080/article/details/82974207
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