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

	using namespace std;
	using namespace Eigen;

	int main()
	{
	Matrix2d A;
	A << 2, 1,
	2, 0.9999999999;
	FullPivLU<Matrix2d> lu(A);
	cout << "By default, the rank of A is found to be " << lu.rank() << endl;
	lu.setThreshold(1e-5);
	cout << "With threshold 1e-5, the rank of A is found to be " << lu.rank() << endl;
	}