TutorialLinAlgExSolveLDLT.cpp
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	#include <iostream>
	#include <Eigen/Dense>

	using namespace std;
	using namespace Eigen;

	int main()
	{
	Matrix2f A, b;
	A << 2, -1, -1, 3;
	b << 1, 2, 3, 1;
	cout << "Here is the matrix A:\n" << A << endl;
	cout << "Here is the right hand side b:\n" << b << endl;
	Matrix2f x = A.ldlt().solve(b);
	cout << "The solution is:\n" << x << endl;
	}