Symmetric matrix program in java

Welcome to flower brackets blog. Today we are going to learn symmetric matrix program in java.

How do you know if a matrix is symmetric?

For a matrix to be symmetric, first it should be a square matrix, every element at “i”th row and “j”th column should be equal to every element at “j”th row and “i”th column.

Symmetric Matrix Program In Java

In other words A[x][y] is a square matrix of (3 X 3) order, then A[x][y] matrix is said to be symmetric if every element at “x”th row and “y”th column is equal to element at “y”th row and “x”th column.

Also read – matrix transpose java

That is A[x][y] == A[y][x]

Let’s see java program to check if the matrix is symmetric or not,

Also read – sparse matrix java

import java.util.Scanner;

public class SymmetricMatrixDemo
{
   public static void main(String[] args)
   {
      Scanner sc = new Scanner(System.in);
      System.out.println("Please enter number of rows - ");
      int row = sc.nextInt();
      System.out.println("Please enter number of columns - ");
      int col = sc.nextInt();
      int symMatrix[][] = new int[row][col];     
      System.out.println("Please enter the elements - ");

      for(int x = 0; x < row; x++)
      {
         for(int y = 0; y < col; y++)
         {
            symMatrix[x][y] = sc.nextInt();
         }
      }

      System.out.println("Now printing the input matrix - ");
      for(int x = 0; x < row; x++)
      {
         for(int y = 0; y < col; y++)
         {
            System.out.print(symMatrix[x][y] + "\t");
         }
         System.out.println();
      }

      // Now checking for symmetric matrix
      if(row != col)
      {
         System.out.println("It's not a square matrix!!");
      }
      else
      {
         boolean symmetricMatrix = true;
         for(int x = 0; x < row; x++)
         {
            for(int y = 0; y < col; y++)
            {
               if(symMatrix[x][y] != symMatrix[y][x])
               {
                  symmetricMatrix = false;
                  break;
               }
            }
         }

         if(symmetricMatrix)
         {
            System.out.println("It's a symmetric matrix!!");
         }
         else
         {
            System.out.println("It's not a symmetric matrix!!");
         }
      }
      sc.close();
   }
}

Output:

Symmetric Matrix Program In Java

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