#include#include int main() { arma::mat A = {{1.0, 2.0}, {3.0, 4.0}}; arma::mat B = {{5.0}, {6.0}}; arma::mat C = A * B; std::cout << C << std::endl; return 0; }
#includeThis code multiplies the matrix A and the vector B using the Eigen library, and stores the result in the vector C. In determining the package library for matrix multiplication, it depends on the specific requirements and constraints of the project. Armadillo, Eigen, and BLAS/LAPACK are all popular and widely used packages for matrix multiplication in C++.#include int main() { Eigen::Matrix2d A; A << 1, 2, 3, 4; Eigen::Vector2d B(5, 6); Eigen::Vector2d C = A * B; std::cout << C << std::endl; return 0; }