eigen/doc/snippets/MatrixBase_cwiseEqual.cpp

MatrixXi m(2, 2);
m << 1, 0, 1, 1;
cout << "Comparing m with identity matrix:" << endl;
cout << m.cwiseEqual(MatrixXi::Identity(2, 2)) << endl;
Index count = m.cwiseEqual(MatrixXi::Identity(2, 2)).count();
cout << "Number of coefficients that are equal: " << count << endl;