Java program to find transpose of a matrix

Let’s learn java program to find transpose of a matrix.

Java program to find transpose of a matrix

How do you find the transpose of a matrix is one of the common interview question in java. Transpose means converting rows of matrix into columns and columns of matrix into row.

For example:

3x3 matrix
-----------------
a11    a12    a13
a21    a22    a23
a31    a32    a33

transposed 3x3 matrix
-----------------
a11    a21    a31
a12    a22    a32
a13    a23    a33

Let’s see java program to find transpose of a matrix.

import java.util.Scanner;
public class MatrixTransposeInJava
{
   public static void main(String[] args)
   {
      int[][] arrGiven = {{2,4,6},{8,1,3},{5,7,9}};	    
      // another matrix to store transpose of matrix  
      int[][] arrTranspose = new int[3][3];	    
      // transpose matrix code  
      for(int a = 0; a < 3; a++)
      {    
         for(int b = 0; b < 3; b++)
         {    
            arrTranspose[a][b] = arrGiven[b][a];  
         } 
      }	  
      System.out.println("Before matrix transpose: ");  
      for(int a = 0; a < 3; a++)
      {    
         for(int b = 0; b < 3; b++)
         {    
            System.out.print(arrGiven[a][b] + " ");    
         } 
         System.out.println();
      }    
      System.out.println("After matrix transpose: ");  
      for(int a = 0; a < 3; a++)
      {    
         for(int b = 0; b < 3; b++)
         {    
            System.out.print(arrTranspose[a][b] + " ");    
         } 
         System.out.println();
      }
   }
}

Output:

Before matrix transpose:
2 4 6
8 1 3
5 7 9
After matrix transpose:
2 8 5
4 1 7
6 3 9


Also read – abstraction in java