Eigen

Eigen is a high-performance C++ template library for linear algebra, including matrices, vectors, numerical solvers, and related algorithms. It combines exceptional speed with ease of use, supporting various matrix decompositions and geometry features. Its expression templates allow for writing complex operations naturally while the compiler optimizes them into efficient loops. Widely used in projects requiring intense numerical computations, from robotics to machine learning, Eigen delivers reliability and versatility without dependencies beyond the standard C++ library.