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eigen/doc/examples/tut_arithmetic_add_sub.cpp
2026-05-04 00:36:12 +00:00

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C++

// SPDX-FileCopyrightText: The Eigen Authors
// SPDX-License-Identifier: MPL-2.0
#include <iostream>
#include <Eigen/Dense>
int main() {
Eigen::Matrix2d a;
a << 1, 2, 3, 4;
Eigen::MatrixXd b(2, 2);
b << 2, 3, 1, 4;
std::cout << "a + b =\n" << a + b << std::endl;
std::cout << "a - b =\n" << a - b << std::endl;
std::cout << "Doing a += b;" << std::endl;
a += b;
std::cout << "Now a =\n" << a << std::endl;
Eigen::Vector3d v(1, 2, 3);
Eigen::Vector3d w(1, 0, 0);
std::cout << "-v + w - v =\n" << -v + w - v << std::endl;
}