Program to concatenate two given Matrices of same size

Given two matrices A and B of size M x N, the task is to concatenate them into one matrix.

Concatenation of matrix: The process of appending elements of every row of the matrix one after the other is known as the Concatenation of matrix.

Examples:

Input:
A[][] = {{1, 2}, 
         {3, 4}},
B[][] = {{5, 6}, 
         {7, 8}}
Output: 
1 2 5 6
3 4 7 8
Explanation:
Elements of every row of the matrix B 
is appended into the row of matrix A.

Input: 
A[][] = {{2, 4}, 
         {3, 4}}
B[][] = {{1, 2}, 
         {1, 3}}       
Output: 
2 4 1 2 
3 4 1 3

Recommended: Please try your approach on {IDE} first, before moving on to the solution.

Approach: The idea is to declare a matrix of size N x 2*M, then traverse over matrix A and store the elements in the first half of the matrix and then similarly iterate over matrix B and store the elements in another half of the matrix with the help of the below formulae:

// For filling the
// first half of matrix
matrix[i][j] = A[i][j]

// For filling the
// second half of matrix
matrix[i][j+N] = A[i][j + N]

Below is the implementation of the above approach:

C++

// C++ implementation to concatenate 
// two matrices of size N x M 
  
#include <bits/stdc++.h> 
  
using namespace std; 
  
#define M 2 
#define N 2 
  
// Function to concatenate two 
// matrices A[][] and B[][] 
void mergeMatrix(int A[M][N], 
                 int B[M][N]) 
{ 
  
    // Matrix to store 
    // the result 
    int C[M][2 * N]; 
  
    // Merge the two matrices 
    for (int i = 0; i < M; i++) { 
        for (int j = 0; j < N; j++) { 
  
            // To store elements 
            // of matrix A 
            C[i][j] = A[i][j]; 
  
            // To store elements 
            // of matrix B 
            C[i][j + N] = B[i][j]; 
        } 
    } 
  
    // Print the result 
    for (int i = 0; i < M; i++) { 
        for (int j = 0; j < 2 * N; 
             j++) 
            cout << C[i][j] << " "; 
        cout << endl; 
    } 
} 
  
// Driven Code 
int main() 
{ 
    int A[M][N] = { { 1, 2 }, 
                    { 3, 4 } }; 
  
    int B[M][N] = { { 5, 6 }, 
                    { 7, 8 } }; 
  
    // Find the merge of 
    // the 2 matrices 
    mergeMatrix(A, B); 
  
    return 0; 
} 

Java

// Java implementation to concatenate 
// two matrices of size N x M 
class GFG{ 
  
static final int M = 2; 
static final int N = 2; 
  
// Function to concatenate two 
// matrices A[][] and B[][] 
static void mergeMatrix(int A[][], 
                        int B[][]) 
{ 
  
    // Matrix to store 
    // the result 
    int [][]C = new int[M][2 * N]; 
  
    // Merge the two matrices 
    for(int i = 0; i < M; i++) 
    { 
       for(int j = 0; j < N; j++) 
       { 
          // To store elements 
          // of matrix A 
          C[i][j] = A[i][j]; 
            
          // To store elements 
          // of matrix B 
          C[i][j + N] = B[i][j]; 
             
       } 
    } 
  
    // Print the result 
    for(int i = 0; i < M; i++) 
    { 
       for(int j = 0; j < 2 * N; j++) 
          System.out.print(C[i][j] + " "); 
  
       System.out.println(); 
    } 
} 
  
// Driven Code 
public static void main(String[] args) 
{ 
    int A[][] = { { 1, 2 }, 
                  { 3, 4 } }; 
  
    int B[][] = { { 5, 6 }, 
                  { 7, 8 } }; 
  
    // Find the merge of 
    // the 2 matrices 
    mergeMatrix(A, B); 
} 
} 
  
// This code is contributed by gauravrajput1 

Python3

# Python3 implementation to concatenate 
# two matrices of size N x M 
  
M = 2
N = 2
  
# Function to concatenate two 
# matrices A[][] and B[][] 
def mergeMatrix(A, B): 
  
    # Matrix to store 
    # the result 
    C = [[0 for j in range(2 * N)]  
            for i in range(M)] 
      
    # Merge the two matrices 
    for i in range(M): 
        for j in range(N): 
              
            # To store elements 
            # of matrix A 
            C[i][j] = A[i][j] 
              
            # To store elements 
            # of matrix B 
            C[i][j + N] = B[i][j] 
      
    # Print the result 
    for i in range(M): 
        for j in range(2 * N):      
            print(C[i][j], end = ' ') 
              
        print() 
  
# Driver code  
if __name__=='__main__': 
      
    A = [ [1, 2], [3, 4] ] 
    B = [ [5, 6], [7, 8] ] 
      
    # Find the merge of 
    # the 2 matrices 
    mergeMatrix(A, B) 
  
# This code is contributed by rutvik_56

C#

// C# implementation to concatenate  
// two matrices of size N x M  
using System; 
  
class GFG{ 
      
const int M = 2;  
const int N = 2;  
      
// Function to concatenate two  
// matrices A[][] and B[][]  
static void mergeMatrix(int[,] A, int[,] B)  
{  
      
    // Matrix to store  
    // the result  
    int[,] C = new int[M, 2 * N];  
      
    // Merge the two matrices  
    for(int i = 0; i < M; i++)  
    {  
       for(int j = 0; j < N; j++) 
       {  
             
          // To store elements  
          // of matrix A  
          C[i, j] = A[i, j];  
            
          // To store elements  
          // of matrix B  
          C[i, j + N] = B[i, j];  
       }  
    }  
      
    // Print the result  
    for(int i = 0; i < M; i++)  
    {  
       for(int j = 0; j < 2 * N; j++)  
          Console.Write(C[i, j] + " "); 
      
       Console.WriteLine(); 
    }  
}  
  
// Driver code 
static void Main() 
{ 
    int[,] A = { { 1, 2 },  
                 { 3, 4 } };  
  
    int[,] B = { { 5, 6 },  
                 { 7, 8 } };  
      
    // Find the merge of  
    // the 2 matrices  
    mergeMatrix(A, B);  
} 
} 
  
// This code is contributed by divyeshrabadiya07 

Output:

1 2 5 6 
3 4 7 8

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My Personal Notes

Recommended: Please try your approach on {IDE} first, before moving on to the solution.

C++

Java

Python3

C#

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