eigen/doc/snippets/MatrixBase_isOrthogonal.cpp

Vector3d v(1, 0, 0);
Vector3d w(1e-4, 0, 1);
cout << "Here's the vector v:" << endl << v << endl;
cout << "Here's the vector w:" << endl << w << endl;
cout << "v.isOrthogonal(w) returns: " << v.isOrthogonal(w) << endl;
cout << "v.isOrthogonal(w,1e-3) returns: " << v.isOrthogonal(w, 1e-3) << endl;