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#include <iostream>
#include <stdlib.h>
using namespace std;
class MyMatrix
{
public:
MyMatrix(int dimension);
MyMatrix(int rows, int columns);
~MyMatrix();
void print();
int get_rows();
int get_columns();
double get_element(int row, int column);
void set_element(int row, int column, double value);
MyMatrix operator + (MyMatrix A);
MyMatrix operator * (MyMatrix A);
void operator = (MyMatrix A);
private:
double* m;
int row_d;
int col_d;
int d;
};
MyMatrix::MyMatrix(int dimension)
{
row_d = dimension;
col_d = dimension;
d = dimension*dimension;
m = new double[d];
unsigned int k=0;
for(unsigned int i=0; i<row_d; i++) {
for(unsigned int j=0; j<col_d; j++) {
if(i==j) {
m[k] = 1;
} else {
m[k] = 0;
}
k++;
}
}
}
MyMatrix::MyMatrix(int rows, int columns)
{
row_d = rows;
col_d = columns;
d = rows*columns;
m = new double[d];
srand(time(NULL));
for(unsigned int i=0; i<d; i++) {
m[i] = 1+(rand()%(100-1+1));
}
}
MyMatrix::~MyMatrix()
{
delete[] m;
}
void MyMatrix::print()
{
unsigned int k=0;
for(unsigned int i=0; i<row_d; i++) {
for(unsigned int j=0; j<col_d; j++) {
cout << m[k] << " ";
k++;
}
cout << endl;
}
}
int MyMatrix::get_rows()
{
return row_d;
}
int MyMatrix::get_columns()
{
return col_d;
}
double MyMatrix::get_element(int row, int column)
{
// first element is 1,1!
if((row*column)<=0) {
return -1;
}
return m[((row-1)*col_d)+(column-1)];
}
void
MyMatrix::set_element(int row, int column, double value)
{
if((row*column)>0) {
m[((row-1)*col_d)+(column-1)] = value;
}
}
MyMatrix
MyMatrix::operator + (MyMatrix A)
{
MyMatrix* res = new MyMatrix(row_d, col_d);
unsigned int k=0;
for(unsigned int i=0; i<row_d; i++) {
for(unsigned int j=0; j<col_d; j++) {
res->m[k] = m[k]+A.get_element(i+1, j+1);
k++;
}
}
return *res;
}
MyMatrix MyMatrix::operator * (MyMatrix A)
{
MyMatrix* res = new MyMatrix(row_d, col_d);
unsigned int k=0;
for(unsigned int i=0; i<row_d; i++) {
for(unsigned int j=0; j<col_d; j++) {
res->m[k] = m[k]*A.get_element(i+1, j+1);
k++;
}
}
return *res;
}
void MyMatrix::operator = (MyMatrix A)
{
unsigned int k=0;
for(unsigned int i=0; i<A.get_rows(); i++) {
for(unsigned int j=0; j<A.get_columns(); j++) {
m[k] = A.get_element(i+1, j+1);
k++;
}
}
}
int main (int argc, char* const argv[]) {
cout << "9x9 identity matrix:" << endl;
MyMatrix* m = new MyMatrix(9);
m->print();
cout << " rows: " << m->get_rows() << ", ";
cout << "columns: " << m->get_columns() << endl;
delete m;
cout << endl << "2x5 matrix:" << endl;
MyMatrix n(2,5);
n.print();
cout << " rows: " << n.get_rows() << ", ";
cout << "columns: " << n.get_columns() << endl;
cout << "(1,3) = " << n.get_element(1,3) << endl;
cout << "last: (2,5) = " << n.get_element(2,5) << endl;
cout << "second to last element = 100: " << endl;
n.set_element(2, 4, 100);
n.print();
cout << endl << "addition:" << endl;
cout << "matrix 1:" << endl;
MyMatrix* a1 = new MyMatrix(3,3);
a1->print();
cout << "matrix 2:" << endl;
MyMatrix* a2 = new MyMatrix(3,3);
a2->print();
cout << "result:" << endl;
MyMatrix* e1 = new MyMatrix(3,3);
*e1 = *a1+*a2;
e1->print();
delete e1;
cout << endl << "multiplication" << endl;
cout << "matrix 1:" << endl;
MyMatrix* m1 = new MyMatrix(3,3);
a1->print();
cout << "matrix 2:" << endl;
MyMatrix* m2 = new MyMatrix(3,3);
m2->print();
cout << "result:" << endl;
MyMatrix* e2 = new MyMatrix(3,3);
*e2 = *m1 * *m2;
e2->print();
delete e2;
return 0;
}
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