matrix.h
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	#include <vector>
	#include <iostream>
	using namespace std;
	using std::cout;

	class matrix{
	int rows,cols;
	vector<double> data;

	public:
	void initialize(vector<double>,int,int);
	int size();
	double at(int);
	double at(int,int);
	void print();
	matrix transpose();
	matrix vector_transpose();
	bool isValid(matrix x);
	matrix scale(double);
	vector<double> getData();
	int getRows();
	int getCols();
	void update(vector<double>);
	bool isSymmetric();
	bool isPositiveDefinite();
	};