matrix.cpp

#include "matrix.h"
#include <iostream>
using namespace std;

Matrix::Matrix()
{
    m_row = 3;
    m_column = 3;
}

Matrix::Matrix(int row, int column,double**data)
{
    m_row = row;
    m_column = column;
    m_data = data;
}

Matrix::~Matrix()
{
    for (int i = 0; i < m_row; i++)
    {
        delete[] m_data[i];
    }
    delete[] m_data;
}

Matrix::Matrix(const Matrix &matrix)
{
    m_row = matrix.m_row;
    m_column = matrix.m_column;
    m_data = new double*[m_row];
    for (int i = 0; i < m_row; i++)
    {
        m_data[i] = new double[m_column];
    }
    for (int i = 0; i < m_row; i++)
        for (int j = 0; j < m_column; j++)
            m_data[i][j] = matrix.m_data[i][j];
}

void Matrix::operator=(const Matrix& matrix)
{
    m_row = matrix.m_row;
    m_column = matrix.m_column;
    m_data = new double*[m_row];
    for (int i = 0; i < m_row; i++)
    {
        m_data[i] = new double[m_column];
    }
    for (int i = 0; i < m_row; i++)
        for (int j = 0; j < m_column; j++)
            m_data[i][j] = matrix.m_data[i][j];
}

Matrix Matrix::operator*(const Matrix& matrix)
{
    //Matrix result(m_row,matrix.m_column);
    double** data_tmp = new double*[m_row];
    for (int i = 0; i < m_row; i++)
    {
        data_tmp[i] = new double[matrix.m_column];
    }
    for (int i = 0; i < m_row; ++i)
        for (int j = 0; j < matrix.m_column; ++j)
            for (int k = 0; k < m_column; ++k)
            {
                data_tmp[i][j] += m_data[i][k] * matrix.m_data[k][j];
            }
    Matrix result(m_row, matrix.m_column,data_tmp);
    return result;
}

void Matrix::show()
{
    for (int i = 0; i < m_row; i++)
    {
        for (int j = 0; j < m_column; j++)
        {
            cout << m_data[i][j] << " ";
        }
        cout << endl;
    }
}