Oreo  |  8.0.0_r4
C++程序  |  5行  |  177 B 

MatrixXf A = MatrixXf::Random(3, 2);
VectorXf b = VectorXf::Random(3);
cout << "The solution using the QR decomposition is:\n"
     << A.colPivHouseholderQr().solve(b) << endl;