线性代数方程组求解矩阵计算库Eigen配置

1、官网下载eigen3.3.9

       https://eigen.tuxfamily.org/index.php?title=Main_Page

       3.4.0版本安装会出现问题

2、解压缩，将文件夹改名为Eigen3，且不要出现多级目录

3、打开VS，项目属性-》所有平台-》所有配置，VC++包含目录下，添加Eigen3目录，勾选继承；

 

 

4、测试是否安装成功

#include <iostream>
#include <Eigen\Dense>
using namespace std;
using namespace Eigen;
void main()
{
    Matrix2d a;
    a << 1, 2,
        3, 4;
    MatrixXd b(2, 2);
    b << 2, 3,
        1, 4;
    cout << "a + b =\n" << a + b << endl;
    cout << "a - b =\n" << a - b << endl;
    cout << "Doing a += b;" << endl;
    a += b;
    cout << "Now a =\n" << a << endl;
    cout << "a^T=  " << a.transpose() << endl;
    cout << "a*b= " << a * b << endl;
    Vector3d v(1, 2, 3);
    Vector3d w(1, 0, 0);
    cout << "-v + w - v =\n" << -v + w - v << endl;
    cout << v << endl;
    cout << v.transpose() << endl;
    system("pause");
}

6、对于其他平台，类似，仅需要把Eigen3的路径进行包含即可