What is the Eigen library in C++?

What is the Eigen library in C++?

The Eigen library is a C++ template library for linear algebra, providing high-performance matrix and vector operations.

What are some key features of the Eigen library?

Key features include support for dense and sparse matrices, automatic differentiation, and a wide range of linear algebra algorithms.

How do I install the Eigen library?

You can install Eigen by downloading it from the official website or using package managers like vcpkg or conan.

Can you give me a simple example of using Eigen?

Sure! Here's a simple example:

#include <Eigen/Dense>
using namespace Eigen;
int main() {
    Matrix2d m;
    m(0, 0) = 3;
    m(1, 0) = 2.5;
    m(0, 1) = -1;
    m(1, 1) = m(1, 0) + m(0, 1);
    std::cout << m << std::endl;
}