matrix.hh
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	#include <string>
	#include <vector>

	#ifndef __MATRIX_H_
	#define __MATRIX_H_

	class Matrix {
	public:
	Matrix(int m = 0, int n = 0) : m_m(m), m_n(n), m_a(m * n) {}
	void resize(int m, int n) {
	m_m = m;
	m_n = n;
	m_a.resize(m * n);
	}

	inline double & operator()(int i, int j) { return m_a[i * m_n + j]; }

	inline int m() const { return m_m; }
	inline int n() const { return m_n; }
	inline double * data() { return m_a.data(); }

	void read(const std::string & filename);

	private:
	int m_m{0};
	int m_n{0};
	std::vector<double> m_a;
	};

	#endif // __MATRIX_H_