#include <triqs/arrays.hpp>
using namespace triqs::arrays;
int main() {
 array<double, 2> A(2, 3);
 A() = 0; //  assign 0 to A
 A(0, 0) = 5;
 A(1, 1) = 2 * A(0, 0);
 std::cout << "A = " << A << std::endl;
}