Matrix.hpp

#pragma once
#include <iostream>
#include <random>

class Matrix
{
private:
	double* _matrix;
public:
	int row;
	int col;
	Matrix();
	Matrix(int _row, int _col);
	Matrix(int _row, int _col, double* args);
	bool resize(int _row, int _col);
	double operator()(int i, int j) const;
	double* operator[](int i);
	bool operator==(const Matrix _mat)const;
	bool operator!=(const Matrix _mat)const;
	Matrix& operator+=(const Matrix& _mat);
	Matrix& operator-=(const Matrix& _mat);
	void random(double min, double max);
	void random(double min, double max, int seed);
	~Matrix();
	Matrix& Matrix::operator=(const Matrix _mat)
	{
		resize(_mat.row, _mat.col);
		for (int i = 0; i < _mat.row; ++i)
		{
			for (int j = 0; j < _mat.col; ++j)
			{
				_matrix[i * col + j] = _mat(i, j);
			}
		}
		return (*this);
	}
	inline Matrix Matrix::operator+(const Matrix& _mat) const
	{
		if (_mat.row != this->row) throw "ArgumentException";
		if (_mat.col != this->col) throw "ArgumentException";
		Matrix ret(this->row, this->col);
		for (int i = 0; i < this->row; ++i)
		{
			for (int j = 0; j < this->col; ++j)
			{
				ret[i][j] = (*this)(i, j) + _mat(i, j);
			}
		}
		return ret;
	}
	inline Matrix Matrix::operator-(const Matrix& _mat) const
	{
		if (_mat.row != this->row) throw "ArgumentException";
		if (_mat.col != this->col) throw "ArgumentException";
		Matrix ret(this->row, this->col);
		for (int i = 0; i < this->row; ++i)
		{
			for (int j = 0; j < this->col; ++j)
			{
				ret[i][j] = (*this)(i, j) - _mat(i, j);
			}
		}
		return ret;
	}

	inline Matrix Matrix::operator*(const Matrix& _mat) const
	{
		if (this->col != _mat.row) throw "ArgumentException";
		Matrix ret(this->row, _mat.col);
		for (int i = 0; i < this->row; ++i)
		{
			for (int j = 0; j < _mat.col; ++j)
			{
				for (int k = 0; k < this->col; ++k)
				{
					ret[i][j] += (*this)(i, k) * _mat(k, j);
				}
			}
		}
		return ret;
	}

	inline Matrix Matrix::operator*(const double x) const
	{
		Matrix ret(this->row, this->col);
		for (int i = 0; i < this->row; ++i)
		{
			for (int j = 0; j < this->col; ++j)
			{
				ret[i][j] = (*this)(i, j) * x;
			}
		}
		return ret;
	}


	inline Matrix Matrix::operator/(const double x) const
	{
		Matrix ret(this->row, this->col);
		for (int i = 0; i < this->row; ++i)
		{
			for (int j = 0; j < this->col; ++j)
			{
				ret[i][j] = (*this)(i, j) / x;
			}
		}
		return ret;
	}

	inline Matrix Matrix::transpose() const
	{
		Matrix ret(this->col, this->row);
		for (int i = 0; i < this->row; ++i)
		{
			for (int j = 0; j < this->col; ++j)
			{
				ret[j][i] = (*this)(i, j);
			}
		}
		return ret;
	}
};