1、安装：sudo apt-get install libeigen3-dev

2 、调整，默认安装路径是：/usr/include/eigen3

cd /usr/include/eigen3

Series:/usr/include/eigen3$ ls
Eigen signature_of_eigen3_matrix_library unsupported

需要执行复制命令，将Eigen文件夹放在/usr/include 下面

sudo cp Eigen/ .. -R

3、demo运行

vi myeigen.c

编辑文件

#include <iostream>
#include <Eigen/Dense>

//using Eigen::MatrixXd;
using namespace Eigen;
using namespace Eigen::internal;
using namespace Eigen::Architecture;

using namespace std;

int main()
{
        cout<<"*******************1D-object****************"<<endl;

        Vector4d v1;
        v1<< 1,2,3,4;
        cout<<"v1=\n"<<v1<<endl;


        VectorXd v2(3);
        v2<<1,3;
        cout<<"v2=\n"<<v2<<endl;


        Array4i v3;
        v3<<1,4;
        cout<<"v3=\n"<<v3<<endl;


        ArrayXf v4(3);
        v4<<1,3;
        cout<<"v4=\n"<<v4<<endl;
}

编译 g++ myeigen.c

运行 ./a.out

结果：

*******************1D-object****************
v1=
1
2
3
4
v2=
1
2
3
v3=
1
2
3
4
v4=
1
2
3