main.cpp

#include <cmath>
#include <eigen3/Eigen/Core>
#include <eigen3/Eigen/Dense>
#include <iostream>

int main()
{

    // Basic Example of cpp
    std::cout << "Example of cpp \n";
    float a = 1.0, b = 2.0;
    std::cout << a << std::endl;
    std::cout << a / b << std::endl;
    std::cout << std::sqrt(b) << std::endl;
    std::cout << std::acos(-1) << std::endl;
    std::cout << std::sin(30.0 / 180.0 * acos(-1)) << std::endl;

    // Example of vector
    std::cout << "Example of vector \n";
    // vector definition
    Eigen::Vector3f v(1.0f, 2.0f, 3.0f);
    Eigen::Vector3f w(1.0f, 0.0f, 0.0f);
    // vector output
    std::cout << "Example of output \n";
    std::cout << v << std::endl;
    // vector add
    std::cout << "Example of add \n";
    std::cout << v + w << std::endl;
    // vector scalar multiply
    std::cout << "Example of scalar multiply \n";
    std::cout << v * 3.0f << std::endl;
    std::cout << 2.0f * v << std::endl;

    // Example of matrix
    std::cout << "Example of matrix \n";
    // matrix definition
    Eigen::Matrix3f i, j;
    i << 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0;
    j << 2.0, 3.0, 1.0, 4.0, 6.0, 5.0, 9.0, 7.0, 8.0;
    // matrix output
    std::cout << "Example of output \n";
    std::cout << i << std::endl;
    // matrix add i + j
    std::cout << (i + j) << std::endl;
    // matrix scalar multiply i * 2.0
    std::cout << (i * 2.0) << std::endl;
    // matrix multiply i * j
    std::cout << (i * j) << std::endl;
    // matrix multiply vector i * v
    std::cout << (i * v) << std::endl;

    std::cout << "transformed" << std::endl;
    Eigen::Vector3f p(2.0, 1.0, 1.0);
    Eigen::Matrix3f m_transform;
    m_transform << sqrt(0.5), -sqrt(0.5), 1, sqrt(0.5), sqrt(0.5), 2, 0, 0, 1;
    std::cout << (m_transform * p) << std::endl;
    return 0;
}