一个矩阵操作类
一个处理矩阵的类,没有用到任何第三方类库。实现了转置,求逆等功能。
这里需要感谢
////////////////////////////////////////////////////////////////
//文件名:CMatrix.cpp
//功 能:矩阵类CMatrix的实现
//原作 者:01计机(1)班 何海强 200124151109
//
//修改者: 同济大学 艾智杰
// 逆矩阵的算法参考了lwanttowin回答帖子时候使用的代码,在此表示感谢。
// http://www.programfan.com/club/showpost.asp?id=124327&t=o
////////////////////////////////////////////////////////////////
代码
#ifndef __CMATRIX__
#define __CMATRIX__
class CMatrix //矩阵类
{
public:
//构造函数、析构函数、拷贝构造函数、赋值运算符
CMatrix(int row, int col);
~CMatrix();
CMatrix(const CMatrix &rhs);
CMatrix& operator=(const CMatrix &rhs);
public:
//填充矩阵
bool setMatrix(const double *array, int size);
//获取矩阵中的所有元素
bool getMatrix(double *array, int size);
//获取矩阵的行数
void getRow(int &row);
//获取矩阵的列数
void getCol(int &col);
//显示矩阵
bool display(void);
public:
//矩阵相加
bool Add(const CMatrix &rhs);
//矩阵相减
bool Minus(const CMatrix &rhs);
//矩阵相乘
bool Multiply(const CMatrix &rhs);
//常数与矩阵相乘
bool Multiply(const double constant);
public:
//矩阵转置,结果保存在rhs中
bool TransposeMatrix();
//求逆矩阵,结果保存在rhs中
bool InverseMatrix();
private:
bool ContraryMatrix(double *const pMatrix, double *const _pMatrix, const int &dim);
CMatrix(){}
private:
double *m_matrix; //指向矩阵的指针
int m_row; //矩阵的行数
int m_col; //矩阵的列数
};
#endif
#define __CMATRIX__
class CMatrix //矩阵类
{
public:
//构造函数、析构函数、拷贝构造函数、赋值运算符
CMatrix(int row, int col);
~CMatrix();
CMatrix(const CMatrix &rhs);
CMatrix& operator=(const CMatrix &rhs);
public:
//填充矩阵
bool setMatrix(const double *array, int size);
//获取矩阵中的所有元素
bool getMatrix(double *array, int size);
//获取矩阵的行数
void getRow(int &row);
//获取矩阵的列数
void getCol(int &col);
//显示矩阵
bool display(void);
public:
//矩阵相加
bool Add(const CMatrix &rhs);
//矩阵相减
bool Minus(const CMatrix &rhs);
//矩阵相乘
bool Multiply(const CMatrix &rhs);
//常数与矩阵相乘
bool Multiply(const double constant);
public:
//矩阵转置,结果保存在rhs中
bool TransposeMatrix();
//求逆矩阵,结果保存在rhs中
bool InverseMatrix();
private:
bool ContraryMatrix(double *const pMatrix, double *const _pMatrix, const int &dim);
CMatrix(){}
private:
double *m_matrix; //指向矩阵的指针
int m_row; //矩阵的行数
int m_col; //矩阵的列数
};
#endif
代码
#include <iostream>
#include "CMatrix.h"
#include <math.h>
using namespace std;
//一般构造函数
CMatrix::CMatrix(int row, int col)
:m_matrix(NULL), m_row(0), m_col(0)
{
int length = 0;
//判断行数与列数是否合乎规定
if ((row < 1) || (col < 1))
{
return;
}
length = row * col;
m_matrix = new double[length]; //为矩阵分配内存空间
if (NULL == m_matrix)
{
return;
}
else
{
m_row = row;
m_col = col;
//首先用0来填充矩阵里面的所有元素
memset(m_matrix, 0, length * sizeof(double));
}
}
//析构函数
CMatrix::~CMatrix()
{
if (NULL != m_matrix)
{
delete [] m_matrix; //释放矩阵所占用的内存
}
}
//拷贝构造函数
CMatrix::CMatrix(const CMatrix &rhs)
:m_matrix(NULL), m_row(rhs.m_row), m_col(rhs.m_col)
{
int length = 0;
if (NULL == rhs.m_matrix) //矩阵rhs为空
{
return;
}
length = m_row * m_col;
m_matrix = new double[length]; //为矩阵分配内存空间
if (NULL == m_matrix)
{
m_row = 0;
m_col = 0;
return;
}
else
{
//用rhs矩阵里面的元素来填充本矩阵
memcpy(m_matrix, rhs.m_matrix, length * sizeof(double) );
}
}
//赋值运算符
CMatrix& CMatrix::operator=(const CMatrix &rhs)
{
int length = 0;
//判断是否自赋值
if (this != &rhs)
{
//释放原矩阵所占用的内存
delete [] m_matrix;
m_matrix = NULL;
m_row = 0;
m_col = 0;
//矩阵rhs是否为空
if (rhs.m_matrix != NULL)
{
length = rhs.m_row * rhs.m_col;
m_matrix = new double [length]; //为矩阵分配内存空间
if (m_matrix != NULL)
{
m_row = rhs.m_row;
m_col = rhs.m_col;
//用rhs矩阵里面的元素来填充本矩阵
memcpy(m_matrix, rhs.m_matrix, length * sizeof(double) );
}
} //if ((rhs.m_row > 0) && (rhs.m_col > 0))
}
return *this; //返回本对象的引用
}
//填充矩阵
bool CMatrix::setMatrix(const double *array, int size)
{
if ((NULL == m_matrix) || (NULL == array))
{
return false;
}
if (size != (m_row * m_col)) //长度不相符
{
return false;
}
else
{
//用数组array里面的值来填充本矩阵
memcpy(m_matrix, array, size * sizeof(double));
return true;
}
}
//获取矩阵中的所有元素
bool CMatrix::getMatrix(double *array, int size)
{
int length = 0;
if ( (NULL == m_matrix)
|| (NULL == array)
|| (size != m_col * m_row))
{
return false;
}
else
{
length = m_row * m_col;
//用数组array来返回本矩阵中所有元素值
memcpy(array, m_matrix, length * sizeof(double) );
return true;
}
}
//获取矩阵的行数
void CMatrix::getRow(int &row)
{
row = m_row;
}
//获取矩阵的列数
void CMatrix::getCol(int &col)
{
col = m_col;
}
//显示矩阵
bool CMatrix::display(void)
{
if (NULL == m_matrix) //本矩阵为空
{
return false;
}
else
{
//按行输出矩阵
for (int row = 0; row < m_row; ++row)
{
for (int col = 0; col < m_col; ++col)
{
cout << m_matrix[row * m_col + col] << '\t'; //同一行中的矩阵元素之间用一个tab 隔开
}
cout << '\n'; //准备输出下一行
}
return true;
}
}
//矩阵相加
bool CMatrix::Add(const CMatrix &rhs)
{
bool b = false;
//判断两个矩阵的行数与列数是否分别相等
if ((m_row == rhs.m_row) && (m_col == rhs.m_col))
{
if (NULL == m_matrix)
{
return b;
}
else
{
b = true;
int length = m_row * m_col;
for (int index = 0; index < length; ++index)
{
m_matrix[index] = m_matrix[index] + rhs.m_matrix[index]; //相加
}
} //if ((m_row < 1) || (m_col < 1))
}
return b;
}
//矩阵相减
bool CMatrix::Minus(const CMatrix &rhs)
{
CMatrix temp = rhs;
temp.Multiply(-1);
return this->Add(temp);
}
//矩阵相乘
bool CMatrix::Multiply(const CMatrix &rhs)
{
bool b = false;
if (m_col == rhs.m_row) //第一个矩阵的列数与第二个矩阵的行数相等
{
if (NULL == m_matrix)
{
return b;
}
else
{
b = true;
CMatrix tempMatrix(m_row, rhs.m_col);
for (int row = 0; row < m_row; ++row) //行
{
for (int col = 0; col < rhs.m_col; ++col) //列
{
for (int index = 0; index < m_col; ++index)
{
tempMatrix.m_matrix[row*rhs.m_col+col] +=
(m_matrix[row*m_col+index] * rhs.m_matrix[index*rhs.m_col+col]);
}
}
}
memcpy(m_matrix, tempMatrix.m_matrix, m_col * m_row * sizeof(double) );
} //if (NULL == m_matrix)
}
return b;
}
//常数与矩阵相乘
bool CMatrix::Multiply(const double constant)
{
bool b = false;
//本矩阵是否为空
if (NULL == m_matrix)
{
return b;
}
else
{
b = true;
int length = m_row * m_col;
for (int index = 0; index < length; ++index)
{
this->m_matrix[index] = m_matrix[index] * constant; //矩阵元素与常数相乘
}
}
return b;
}
//矩阵转置,结果保存在rhs中
bool CMatrix::TransposeMatrix()
{
if (this->m_matrix == NULL)
{
return false;
}
CMatrix temp(m_row, m_col);
for (int i = 0; i < m_row; i++)
{
for (int j = 0; j < m_col;j++)
{
*(temp.m_matrix + j * m_col + i) = *(m_matrix + i * m_col + j);
}
}
memcpy( this->m_matrix, temp.m_matrix, m_row * m_col * sizeof(double) );
return true;
}
//求逆矩阵,结果保存在rhs中
bool CMatrix::InverseMatrix()
{
bool b = false;
if (m_col != m_row)
{
// 不是方阵
return b;
}
b = ContraryMatrix(this->m_matrix, this->m_matrix, m_col);
return b;
}
//求pMatrix的逆矩阵,并存结果于矩阵_pMatrix中
bool CMatrix::ContraryMatrix(double *const pMatrix, double *const _pMatrix, const int &dim)
{
bool b = true;
double *tMatrix = new double[2*dim*dim];
for (int i=0; i<dim; i++){
for (int j=0; j<dim; j++)
tMatrix[i*dim*2+j] = pMatrix[i*dim+j];
}
for (int i=0; i<dim; i++){
for (int j=dim; j<dim*2; j++)
tMatrix[i*dim*2+j] = 0.0;
tMatrix[i*dim*2+dim+i] = 1.0;
}
//Initialization over!
for (int i=0; i<dim; i++)//Process Cols
{
double base = tMatrix[i*dim*2+i];
if (fabs(base) < 1E-300){
cout << endl << "zero is divied!" << endl;
b = false;
return b;
}
for (int j=0; j<dim; j++)//row
{
if (j == i) continue;
double times = tMatrix[j*dim*2+i]/base;
for (int k=0; k<dim*2; k++)//col
{
tMatrix[j*dim*2+k] = tMatrix[j*dim*2+k] - times*tMatrix[i*dim*2+k];
}
}
for (int k=0; k<dim*2; k++){
tMatrix[i*dim*2+k] /= base;
}
}
for (int i=0; i<dim; i++)
{
for (int j=0; j<dim; j++)
_pMatrix[i*dim+j] = tMatrix[i*dim*2+j+dim];
}
delete[] tMatrix;
return b;
}
////////////////////////////////////////////////////////////////
#include "CMatrix.h"
#include <math.h>
using namespace std;
//一般构造函数
CMatrix::CMatrix(int row, int col)
:m_matrix(NULL), m_row(0), m_col(0)
{
int length = 0;
//判断行数与列数是否合乎规定
if ((row < 1) || (col < 1))
{
return;
}
length = row * col;
m_matrix = new double[length]; //为矩阵分配内存空间
if (NULL == m_matrix)
{
return;
}
else
{
m_row = row;
m_col = col;
//首先用0来填充矩阵里面的所有元素
memset(m_matrix, 0, length * sizeof(double));
}
}
//析构函数
CMatrix::~CMatrix()
{
if (NULL != m_matrix)
{
delete [] m_matrix; //释放矩阵所占用的内存
}
}
//拷贝构造函数
CMatrix::CMatrix(const CMatrix &rhs)
:m_matrix(NULL), m_row(rhs.m_row), m_col(rhs.m_col)
{
int length = 0;
if (NULL == rhs.m_matrix) //矩阵rhs为空
{
return;
}
length = m_row * m_col;
m_matrix = new double[length]; //为矩阵分配内存空间
if (NULL == m_matrix)
{
m_row = 0;
m_col = 0;
return;
}
else
{
//用rhs矩阵里面的元素来填充本矩阵
memcpy(m_matrix, rhs.m_matrix, length * sizeof(double) );
}
}
//赋值运算符
CMatrix& CMatrix::operator=(const CMatrix &rhs)
{
int length = 0;
//判断是否自赋值
if (this != &rhs)
{
//释放原矩阵所占用的内存
delete [] m_matrix;
m_matrix = NULL;
m_row = 0;
m_col = 0;
//矩阵rhs是否为空
if (rhs.m_matrix != NULL)
{
length = rhs.m_row * rhs.m_col;
m_matrix = new double [length]; //为矩阵分配内存空间
if (m_matrix != NULL)
{
m_row = rhs.m_row;
m_col = rhs.m_col;
//用rhs矩阵里面的元素来填充本矩阵
memcpy(m_matrix, rhs.m_matrix, length * sizeof(double) );
}
} //if ((rhs.m_row > 0) && (rhs.m_col > 0))
}
return *this; //返回本对象的引用
}
//填充矩阵
bool CMatrix::setMatrix(const double *array, int size)
{
if ((NULL == m_matrix) || (NULL == array))
{
return false;
}
if (size != (m_row * m_col)) //长度不相符
{
return false;
}
else
{
//用数组array里面的值来填充本矩阵
memcpy(m_matrix, array, size * sizeof(double));
return true;
}
}
//获取矩阵中的所有元素
bool CMatrix::getMatrix(double *array, int size)
{
int length = 0;
if ( (NULL == m_matrix)
|| (NULL == array)
|| (size != m_col * m_row))
{
return false;
}
else
{
length = m_row * m_col;
//用数组array来返回本矩阵中所有元素值
memcpy(array, m_matrix, length * sizeof(double) );
return true;
}
}
//获取矩阵的行数
void CMatrix::getRow(int &row)
{
row = m_row;
}
//获取矩阵的列数
void CMatrix::getCol(int &col)
{
col = m_col;
}
//显示矩阵
bool CMatrix::display(void)
{
if (NULL == m_matrix) //本矩阵为空
{
return false;
}
else
{
//按行输出矩阵
for (int row = 0; row < m_row; ++row)
{
for (int col = 0; col < m_col; ++col)
{
cout << m_matrix[row * m_col + col] << '\t'; //同一行中的矩阵元素之间用一个tab 隔开
}
cout << '\n'; //准备输出下一行
}
return true;
}
}
//矩阵相加
bool CMatrix::Add(const CMatrix &rhs)
{
bool b = false;
//判断两个矩阵的行数与列数是否分别相等
if ((m_row == rhs.m_row) && (m_col == rhs.m_col))
{
if (NULL == m_matrix)
{
return b;
}
else
{
b = true;
int length = m_row * m_col;
for (int index = 0; index < length; ++index)
{
m_matrix[index] = m_matrix[index] + rhs.m_matrix[index]; //相加
}
} //if ((m_row < 1) || (m_col < 1))
}
return b;
}
//矩阵相减
bool CMatrix::Minus(const CMatrix &rhs)
{
CMatrix temp = rhs;
temp.Multiply(-1);
return this->Add(temp);
}
//矩阵相乘
bool CMatrix::Multiply(const CMatrix &rhs)
{
bool b = false;
if (m_col == rhs.m_row) //第一个矩阵的列数与第二个矩阵的行数相等
{
if (NULL == m_matrix)
{
return b;
}
else
{
b = true;
CMatrix tempMatrix(m_row, rhs.m_col);
for (int row = 0; row < m_row; ++row) //行
{
for (int col = 0; col < rhs.m_col; ++col) //列
{
for (int index = 0; index < m_col; ++index)
{
tempMatrix.m_matrix[row*rhs.m_col+col] +=
(m_matrix[row*m_col+index] * rhs.m_matrix[index*rhs.m_col+col]);
}
}
}
// 处理原来数据,包括行与列
delete [] this->m_matrix;
m_col = rhs.m_col;
m_matrix = new double [m_row*m_col];
memcpy(m_matrix, tempMatrix.m_matrix, m_col * m_row * sizeof(double) );
} //if (NULL == m_matrix)
}
return b;
}
//常数与矩阵相乘
bool CMatrix::Multiply(const double constant)
{
bool b = false;
//本矩阵是否为空
if (NULL == m_matrix)
{
return b;
}
else
{
b = true;
int length = m_row * m_col;
for (int index = 0; index < length; ++index)
{
this->m_matrix[index] = m_matrix[index] * constant; //矩阵元素与常数相乘
}
}
return b;
}
//矩阵转置,结果保存在rhs中
bool CMatrix::TransposeMatrix()
{
if (this->m_matrix == NULL)
{
return false;
}
CMatrix temp(m_row, m_col);
for (int i = 0; i < m_row; i++)
{
for (int j = 0; j < m_col;j++)
{
*(temp.m_matrix + j * m_col + i) = *(m_matrix + i * m_col + j);
}
}
memcpy( this->m_matrix, temp.m_matrix, m_row * m_col * sizeof(double) );
return true;
}
//求逆矩阵,结果保存在rhs中
bool CMatrix::InverseMatrix()
{
bool b = false;
if (m_col != m_row)
{
// 不是方阵
return b;
}
b = ContraryMatrix(this->m_matrix, this->m_matrix, m_col);
return b;
}
//求pMatrix的逆矩阵,并存结果于矩阵_pMatrix中
bool CMatrix::ContraryMatrix(double *const pMatrix, double *const _pMatrix, const int &dim)
{
bool b = true;
double *tMatrix = new double[2*dim*dim];
for (int i=0; i<dim; i++){
for (int j=0; j<dim; j++)
tMatrix[i*dim*2+j] = pMatrix[i*dim+j];
}
for (int i=0; i<dim; i++){
for (int j=dim; j<dim*2; j++)
tMatrix[i*dim*2+j] = 0.0;
tMatrix[i*dim*2+dim+i] = 1.0;
}
//Initialization over!
for (int i=0; i<dim; i++)//Process Cols
{
double base = tMatrix[i*dim*2+i];
if (fabs(base) < 1E-300){
cout << endl << "zero is divied!" << endl;
b = false;
return b;
}
for (int j=0; j<dim; j++)//row
{
if (j == i) continue;
double times = tMatrix[j*dim*2+i]/base;
for (int k=0; k<dim*2; k++)//col
{
tMatrix[j*dim*2+k] = tMatrix[j*dim*2+k] - times*tMatrix[i*dim*2+k];
}
}
for (int k=0; k<dim*2; k++){
tMatrix[i*dim*2+k] /= base;
}
}
for (int i=0; i<dim; i++)
{
for (int j=0; j<dim; j++)
_pMatrix[i*dim+j] = tMatrix[i*dim*2+j+dim];
}
delete[] tMatrix;
return b;
}
////////////////////////////////////////////////////////////////
------------------------------------------------------------------------
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