How do I use the Eigen library in C++11?

How do I use the Eigen library in C++11?

The Eigen library is a powerful C++ template library for linear algebra. To use it, first include the Eigen header in your project.

What are the basic data types available in Eigen?

Eigen provides several data types, including Matrix, Vector, and Array. You can define them using templates, like Eigen::Matrix<double, 2, 2> for a 2x2 matrix.

Can you show me a simple example of matrix multiplication?

Sure! Here's a simple example:

#include <Eigen/Dense>

int main() {
    Eigen::Matrix2d matA;
    Eigen::Matrix2d matB;
    matA << 1, 2,
             3, 4;
    matB << 5, 6,
             7, 8;
    Eigen::Matrix2d result = matA * matB;
    std::cout << result << std::endl;
    return 0;
}

What if I want to perform operations on large matrices?

Eigen is optimized for performance with large matrices. You can use its built-in functions for operations like addition, multiplication, and more, which are highly efficient.