threed-beam-fea/ext/eigen-3.3.4/doc/snippets/LeastSquaresNormalEquations...

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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;