File: LeastSquaresNormalEquations.cpp

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eigen3 3.4.0-5
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MatrixXf A = MatrixXf::Random(3, 2);
VectorXf b = VectorXf::Random(3);
cout << "The solution using normal equations is:\n"
     << (A.transpose() * A).ldlt().solve(A.transpose() * b) << endl;