ubuntu eigen 安装与使用

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

3demo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<<1,2,3;

cout<<"v2=\n"<<v2<<endl;

Array4i v3;

v3<<1,2,3,4;

cout<<"v3=\n"<<v3<<endl;

ArrayXf v4(3);

v4<<1,2,3;

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