{"id":60089,"library":"eigen3","title":"Eigen3","description":"C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.","status":"active","version":"5.0.1","language":"cpp","source_language":null,"source_url":null,"tags":["linear-algebra","matrix","numerical","template-library"],"install":[{"cmd":"vcpkg install eigen3","lang":"bash","label":"vcpkg"},{"cmd":"# CMakeLists.txt\nfind_package(eigen3 CONFIG REQUIRED)\ntarget_link_libraries(main PRIVATE Eigen3::Eigen)","lang":"cmake","label":"CMake"}],"dependencies":[],"imports":[{"symbol":"Eigen/Dense","correct":"#include <Eigen/Dense>"}],"quickstart":{"code":"#include <Eigen/Dense>\n#include <iostream>\n\nint main() {\n    Eigen::MatrixXd m(2,2);\n    m(0,0) = 3;\n    m(1,0) = 2.5;\n    m(0,1) = -1;\n    m(1,1) = m(1,0) + m(0,1);\n    std::cout << m << std::endl;\n    return 0;\n}","lang":"cpp","description":"Create and print a 2x2 matrix"},"warnings":[],"env_vars":null,"search_vec":"'algebra':7,17 'algorithm':14 'c':2 'eigen3':1 'librari':4,22 'linear':6,16 'linear-algebra':15 'matric':8 'matrix':18 'numer':10,19 'relat':13 'solver':11 'templat':3,21 'template-librari':20 'vector':9","created_at":"2026-06-16T19:16:10.010501+00:00","updated_at":"2026-06-16T19:16:10.010501+00:00","problems":[],"ecosystem":"vcpkg","meta_description":null,"install_score":null,"quickstart_score":null,"quickstart_tag":null,"pypi_latest":null,"cli_name":null,"cli_version":null,"type":"library","homepage":null,"github":null,"docs":null,"changelog":null,"pypi":null,"npm":null,"openapi_spec":null,"status_page":null,"smithery":null,"categories":["utility"],"base_url":null,"auth_type":null,"provenance":{"verified_status":null,"verified_at":null,"last_verified":"2026-06-17","next_check":"2026-12-14","install_tag":null}}