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matrix multipliction in c++
By 
Eager Earthworm
on Sep 17, 2020
Eager Earthworm
on Sep 17, 2020
#include <iostream>
using namespace std;
int main()
{
int a[10][10], b[10][10], mult[10][10], r1, c1, r2, c2, i, j, k;
cout << "Enter rows and columns for first matrix: ";
cin >> r1 >> c1;
cout << "Enter rows and columns for second matrix: ";
cin >> r2 >> c2;
// If column of first matrix in not equal to row of second matrix,
// ask the user to enter the size of matrix again.
while (c1!=r2)
{
cout << "Error! column of first matrix not equal to row of second.";
cout << "Enter rows and columns for first matrix: ";
cin >> r1 >> c1;
cout << "Enter rows and columns for second matrix: ";
cin >> r2 >> c2;
}
// Storing elements of first matrix.
cout << endl << "Enter elements of matrix 1:" << endl;
for(i = 0; i < r1; ++i)
for(j = 0; j < c1; ++j)
{
cout << "Enter element a" << i + 1 << j + 1 << " : ";
cin >> a[i][j];
}
// Storing elements of second matrix.
cout << endl << "Enter elements of matrix 2:" << endl;
for(i = 0; i < r2; ++i)
for(j = 0; j < c2; ++j)
{
cout << "Enter element b" << i + 1 << j + 1 << " : ";
cin >> b[i][j];
}
// Initializing elements of matrix mult to 0.
for(i = 0; i < r1; ++i)
for(j = 0; j < c2; ++j)
{
mult[i][j]=0;
}
// Multiplying matrix a and b and storing in array mult.
for(i = 0; i < r1; ++i)
for(j = 0; j < c2; ++j)
for(k = 0; k < c1; ++k)
{
mult[i][j] += a[i][k] * b[k][j];
}
// Displaying the multiplication of two matrix.
cout << endl << "Output Matrix: " << endl;
for(i = 0; i < r1; ++i)
for(j = 0; j < c2; ++j)
{
cout << " " << mult[i][j];
if(j == c2-1)
cout << endl;
}
return 0;
}
Source: www.programiz.com
2
matrix class in c++
By Unsightly Unicorn
on Jun 22, 2020
Unsightly Unicorn
on Jun 22, 2020
template<class T>
class matrix{
size_t ROW,COL;
vector<vector<T>> mat;
public:
matrix(size_t N, size_t M, int populate = 0){
this->ROW = N;
this->COL = M;
this->mat = vector<vector<T>> (ROW,vector<T> (COL,populate));
}
matrix(size_t N, int populate = 0){
this->ROW = N;
this->COL = N;
this->mat = vector<vector<T>> (ROW,vector<T> (COL,populate));
}
void __init(){
for(int i = 0; i < ROW; ++i){
for(int j = 0; j < COL; ++j){
cin >> this->mat[i][j];
}
}
}
void __display(){
for(int i = 0; i < ROW; ++i){
for(int j = 0; j < COL; ++j){
cout << this->mat[i][j] << " ";
}
cout << "\n";
}
}
matrix<T> operator*(const matrix &rhs)const{
if(this->COL != rhs.ROW){
throw "MATRIX MULTIPLICATION CANNOT HAPPEN WITH THE GIVEN MATRICES"
}
matrix<T> result(this->ROW,rhs.COL);
for(int _i = 0; _i < this->ROW; _i++){
for(int _j = 0; _j < rhs.COL; _j++){
result[_i][_j] = 0;
for(int _k = 0; _k < this->COL; ++_k){
result[_i][_j]+=(this->mat[_i][_k]*rhs.mat[_k][_j]);
}
}
}
return result;
}
matrix<T> power(int n){
if(n == 0)return matrix<T>(this->ROW, this->COL,1);
if(n == 1)return *this;
matrix p = power(n/2);
p = p*p;
if(n%2)p = p*(*this);
return p;
}
};2
c++ program for matrix addition
By @kkithool
on May 02, 2020
@kkithool
on May 02, 2020
#include <iostream>
using namespace std;
int main()
{
int r, c, a[100][100], b[100][100], sum[100][100], i, j;
cout << "Enter number of rows (between 1 and 100): ";
cin >> r;
cout << "Enter number of columns (between 1 and 100): ";
cin >> c;
cout << endl << "Enter elements of 1st matrix: " << endl;
// Storing elements of first matrix entered by user.
for(i = 0; i < r; ++i)
for(j = 0; j < c; ++j)
{
cout << "Enter element a" << i + 1 << j + 1 << " : ";
cin >> a[i][j];
}
// Storing elements of second matrix entered by user.
cout << endl << "Enter elements of 2nd matrix: " << endl;
for(i = 0; i < r; ++i)
for(j = 0; j < c; ++j)
{
cout << "Enter element b" << i + 1 << j + 1 << " : ";
cin >> b[i][j];
}
// Adding Two matrices
for(i = 0; i < r; ++i)
for(j = 0; j < c; ++j)
sum[i][j] = a[i][j] + b[i][j];
// Displaying the resultant sum matrix.
cout << endl << "Sum of two matrix is: " << endl;
for(i = 0; i < r; ++i)
for(j = 0; j < c; ++j)
{
cout << sum[i][j] << " ";
if(j == c - 1)
cout << endl;
}
return 0;
}
Source: www.programiz.com
0
matrix multiplication in c
By Gleaming Grouse
on Jun 30, 2020
Gleaming Grouse
on Jun 30, 2020
#include <stdio.h>
void enterData(int first[][10], int second[][10], int r1, int c1, int r2, int c2);
void multiplyMatrices(int first[][10], int second[][10], int multResult[][10], int r1, int c1, int r2, int c2);
void display(int mult[][10], int r1, int c2);
int main() {
int first[10][10], second[10][10], mult[10][10], r1, c1, r2, c2;
printf("Enter rows and column for the first matrix: ");
scanf("%d %d", &r1, &c1);
printf("Enter rows and column for the second matrix: ");
scanf("%d %d", &r2, &c2);
// Taking input until columns of the first matrix is equal to the rows of the second matrix
while (c1 != r2) {
printf("Error! Enter rows and columns again.\n");
printf("Enter rows and columns for the first matrix: ");
scanf("%d%d", &r1, &c1);
printf("Enter rows and columns for the second matrix: ");
scanf("%d%d", &r2, &c2);
}
// Function to take matrices data
enterData(first, second, r1, c1, r2, c2);
// Function to multiply two matrices.
multiplyMatrices(first, second, mult, r1, c1, r2, c2);
// Function to display resultant matrix after multiplication.
display(mult, r1, c2);
return 0;
}
void enterData(int first[][10], int second[][10], int r1, int c1, int r2, int c2) {
printf("\nEnter elements of matrix 1:\n");
for (int i = 0; i < r1; ++i) {
for (int j = 0; j < c1; ++j) {
printf("Enter a%d%d: ", i + 1, j + 1);
scanf("%d", &first[i][j]);
}
}
printf("\nEnter elements of matrix 2:\n");
for (int i = 0; i < r2; ++i) {
for (int j = 0; j < c2; ++j) {
printf("Enter b%d%d: ", i + 1, j + 1);
scanf("%d", &second[i][j]);
}
}
}
void multiplyMatrices(int first[][10], int second[][10], int mult[][10], int r1, int c1, int r2, int c2) {
// Initializing elements of matrix mult to 0.
for (int i = 0; i < r1; ++i) {
for (int j = 0; j < c2; ++j) {
mult[i][j] = 0;
}
}
// Multiplying first and second matrices and storing in mult.
for (int i = 0; i < r1; ++i) {
for (int j = 0; j < c2; ++j) {
for (int k = 0; k < c1; ++k) {
mult[i][j] += first[i][k] * second[k][j];
}
}
}
}
void display(int mult[][10], int r1, int c2) {
printf("\nOutput Matrix:\n");
for (int i = 0; i < r1; ++i) {
for (int j = 0; j < c2; ++j) {
printf("%d ", mult[i][j]);
if (j == c2 - 1)
printf("\n");
}
}
}
Source: www.programiz.com
0
matrix multipliction in c++
By Eager Earthworm
on Sep 17, 2020
Eager Earthworm
on Sep 17, 2020
// Displaying the multiplication of two matrix.
cout << endl << "Output Matrix: " << endl;
for(i = 0; i < r1; ++i)
for(j = 0; j < c2; ++j)
{
cout << " " << mult[i][j];
if(j == c2-1)
cout << endl;
}
Source: www.programiz.com
0
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