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

	using namespace Eigen;

	int main()
	{
	MatrixXd m(2,2);
	m(0,0) = 3;
	m(1,0) = 2.5;
	m(0,1) = -1;
	m(1,1) = m(1,0) + m(0,1);
	std::cout << "Here is the matrix m:\n" << m << std::endl;
	VectorXd v(2);
	v(0) = 4;
	v(1) = v(0) - 1;
	std::cout << "Here is the vector v:\n" << v << std::endl;
	}