#include #include int main() { Eigen::Array22f m; m << 1,2, 3,4; Eigen::Array44f a = Eigen::Array44f::Constant(0.6); std::cout << "Here is the array a:\n" << a << "\n\n"; a.block<2,2>(1,1) = m; std::cout << "Here is now a with m copied into its central 2x2 block:\n" << a << "\n\n"; a.block(0,0,2,3) = a.block(2,1,2,3); std::cout << "Here is now a with bottom-right 2x3 block copied into top-left 2x3 block:\n" << a << "\n\n"; }