Eigen计算均值和标准差

    Eigen::VectorXf one_vector(3);
    one_vector(0)=1;
    one_vector(1)=2;
    one_vector(2)=3;

    float mean=one_vector.mean();
    for (int i = 0; i < one_vector.rows(); i++)
    {
           one_vector(i)=one_vector(i)-mean;   
    }
    
    float std=sqrt((one_vector.transpose()*one_vector)[0]/3);
    std::cout<<"均值："<<mean<<std::endl;
    std::cout<<"标准差："<<std<<std::endl;
1
2
3
4
5
6
7
8
9
10
11
12
13
14

输出：

均值：2
标准差：0.816497
1
2