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Matrix.cpp
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Matrix.cpp
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#include "Matrix.h"
#include <stdio.h>
#include <cstdlib>
Matrix::Matrix(double**matrix_, int m_, int n_):matrix(matrix_),m(m_),n(n_){
}
Matrix* Matrix::operator*(Matrix that) const{
if(that.m!= this->n){
perror("inconsistent matrix multiplication!");
exit(-1);
}
double** newMatrix = new double*[this->m];
for(int i = 0; i < this->m; i++){
newMatrix[i] = new double[that.n];
}
for(int i = 0; i < this->m; i++)
for(int j = 0; j < that.n; j++){
double x = 0;
for(int k = 0; k < this->n; k++){
x+=this->matrix[i][k]*that.matrix[k][j];
}
newMatrix[i][j] = x;
}
return new Matrix(newMatrix, this->m, that.n);
}
Matrix* Matrix::operator-(Matrix that){
if(this->m!= that.m || this->n != that.n){
perror("inconsistent matrix subtraction!");
exit(-1);
}
for(int i = 0; i < this->m; i++)
for(int j =0; j < this->n; j++){
this->matrix[i][j]-= that.matrix[i][j];
}
return this;
}
double*& Matrix::operator[](int i)const{
if(i >= this->m){
perror("illegal subscript!");
exit(-1);
}
return this->matrix[i];
}
Matrix::~Matrix(){
// for(int i = 0; i < m; i++){
// delete this->matrix[i];
// }
// delete this->matrix;
}