#include <Eigen/Core> #include <iostream> using namespace std; using namespace Eigen; template<typename Derived> const Reshaped<const Derived> reshape_helper(const MatrixBase<Derived>& m, int rows, int cols) { return Reshaped<const Derived>(m.derived(), rows, cols); } int main(int, char**) { MatrixXd m(3, 4); m << 1, 4, 7, 10, 2, 5, 8, 11, 3, 6, 9, 12; cout << m << endl; Ref<const MatrixXd> n = reshape_helper(m, 2, 6); cout << "Matrix m is:" << endl << m << endl; cout << "Matrix n is:" << endl << n << endl; }