-
Notifications
You must be signed in to change notification settings - Fork 0
/
Matrix_Filestream.cpp
150 lines (123 loc) · 2.99 KB
/
Matrix_Filestream.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
#include <stdio.h>
#include <math.h>
#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
using namespace std;
#define VECTOR_SIZE 4
#define MATRIX_ROWS 4
#define MATRIX_COLS 4
//=======================================================
class Vector
{
private:
double v[VECTOR_SIZE];
public:
void Set(int index, double value);
double Get(int index) const;
};
void Vector::Set(int index, double value) {
if (index < VECTOR_SIZE){
v[index] = value;
}
}
double Vector::Get(int index) const{
if (index < VECTOR_SIZE){
return v[index];
}
}
//=======================================================
class Matrix
{
private:
double m[MATRIX_ROWS][MATRIX_COLS];
public:
void Set(int row, int col, double value);
double Get(int row, int col) const;
};
void Matrix::Set(int row, int col, double value){
if (row < MATRIX_ROWS and col < MATRIX_COLS and row >= 0 and col >= 0) {
m[row][col] = value;
}
}
double Matrix::Get(int row, int col) const{
if (row < MATRIX_ROWS and col < MATRIX_COLS){
return m[row][col];
}
}
//=======================================================
Vector Multiply(const Matrix &m, const Vector &v) {
Vector result;
for (int i = 0; i < MATRIX_ROWS; i++){
double res = 0.0;
for (int j = 0; j < MATRIX_COLS; j++){
res += m.Get(i,j) * v.Get(j);
}
result.Set(i, res);
}
return result;
}
int main()
{
string vector_file, matrix_file, result_file;
double tmp;
Vector v;
Matrix m;
// Reading the vector file
cout << "Enter vector filename: ";
cin >> vector_file;
// Reading the matrix file
cout << "Enter matrix filename: ";
cin >> matrix_file;
// File for the results
cout << "Enter result filename: ";
cin >> result_file;
cout << endl;
// Open the files
ifstream myfile;
myfile.open (vector_file);
if (!myfile.is_open ()){
cout << "Unable to open vector file." << endl;
}
else {
for(int i =0; i<4; i++){
if (!(myfile >> tmp)){
cout << "Unable to read vector file." << endl;
break;
}
else
v.Set(i, tmp);
}
cout << "File " << vector_file << " has the following values:" << endl
<< v.Get(0) << endl
<< v.Get(1) << endl
<< v.Get(2) << endl
<< v.Get(3) << endl << endl;
myfile.close();
}
myfile.open(matrix_file);
if (!myfile.is_open()){
cout << "Unable to open matrix file." << endl;
}
else{
for (int i = 0; i<16; i++){
if(!(myfile >> tmp)){
cout << "Unable to read matrix file." << endl;
break;
}
else
m.Set(i%4, i/4, tmp);
}
cout << "File " <<matrix_file << ", row 1 has the following values:" << endl
<< m.Get(0,0) << " " << m.Get(0,1) << " " << m.Get(0,2) << " " << m.Get(0,3) << endl << endl;
myfile.close();
}
// multipy m and v
Vector vv = Multiply(m, v);
ofstream resultf;
resultf.open (result_file);
resultf << vv.Get(0) << " " << vv.Get(1) << " " << vv.Get(2) << " " << vv.Get(3) << endl;
resultf.close();
return 1;
}