eigen/doc/snippets/MatrixBase_reshaped_to_vector.cpp

Matrix4i m = Matrix4i::Random();
cout << "Here is the matrix m:" << endl << m << endl;
cout << "Here is m.reshaped().transpose():" << endl << m.reshaped().transpose() << endl;
cout << "Here is m.reshaped<RowMajor>():  " << endl << m.reshaped<RowMajor>() << endl;