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c++ [eigen库配置和使用]

article 2025/1/20 3:45:40

实验环境

eigen 3.40
下载链接 https://gitlab.com/libeigen/eigen/-/archive/3.4.0/eigen-3.4.0.zip

Visual Studio 2022配置

解压eigen后，在项目中配置包含目录
在这里插入图片描述

代码示例

加头文件

#include <Eigen/Dense>
using namespace Eigen;

矩阵运算

    MatrixXd a(8, 6);
    for (size_t i = 0; i < vecGSYConfigs.size(); ++ i)
    {
        std::shared_ptr<CGSYConfig> pGSYConfig = vecGSYConfigs[i];
        if (!pGSYConfig)
        {
            continue;
        }

        a(i, 0) = pGSYConfig->m_dCol1;
        a(i, 1) = pGSYConfig->m_dCol2;
        a(i, 2) = pGSYConfig->m_dCol3;
        a(i, 3) = pGSYConfig->m_dCol4;
        a(i, 4) = pGSYConfig->m_dCol5;
        a(i, 5) = pGSYConfig->m_dCol6;
    }
    

    VectorXd b(8);
    b(0) = ui->doubleSpinBox_Z2->value();
    b(1) = ui->doubleSpinBox_Z3->value();
    b(2) = ui->doubleSpinBox_Z4->value();
    b(3) = ui->doubleSpinBox_Z5->value();
    b(4) = ui->doubleSpinBox_Z6->value();
    b(5) = ui->doubleSpinBox_Z7->value();
    b(6) = ui->doubleSpinBox_Z8->value();
    b(7) = ui->doubleSpinBox_Z9->value();

    VectorXd z = a.householderQr().solve(b);

    z = z * 0.01;

    std::cout << "z: " << z.transpose() << std::endl;