How to Decrement Matrix Elements by One in Java?

Matrices are nothing but it’s more than a collection of data elements arranged in a rectangular layout that is two-dimensional. In Java, an array with two dimensions can be considered as a matrix.

As per the problem statement we have to subtract an element “1” to each matrix element.

Let’s deep dive into this article, to know how it can be done by using Java programming language.

To show you some instances

Instance-1

• Suppose the original matrix is {{3,1,2},{2,5,9},{6,3,10}};

• After subtracting the element “1” by given matrix, the result index will be −

2 0 1 
1 4 8 
5 2 9

Instance-2

• Suppose the original matrix is {{2,1,9},{5,5,7},{3,6,10}};

• After subtracting the element “1” by given matrix, the result index will be −

1 0 8 
4 4 6 
2 5 9

Algorithm

• Step-1 − Declare and initialize the matrix.

• Step-2 − Create another matrix to store the addition value.

• Step-3 − Subtract the element “1” to the matrix using c[i][j] += a[i][j] - 1.

• Step-4 − Print the result.

Multiple Approaches

We have provided the solution in different approaches.

• By Using Static Initialization of Matrix

• By Using User Defined Method

Let’s see the program along with its output one by one.

Approach-1: By Using Ternary Operator

In this approach, matrix elements will be initialized in the program. Then as per the algorithm decrement matrix elements by one.

Example

public class Main{ 
   
   //main method 
   public static void main(String args[]){
      
      //Initialising the matrix  
      int a[][]={{3,1,2},{2,5,9},{6,3,10}};    
      
      //creating another matrix to store the addition value   
      int c[][]=new int[3][3]; 
      System.out.println("After decrementing each element by 1:"); 
      
      //addition of element 1 to the matrix    
      for(int i=0;i<3;i++){    
         for(int j=0;j<3;j++){
            c[i][j]+=a[i][j] - 1;      
            
            //printing the result
            System.out.print(c[i][j]+" ");  
         }  
         
         //new line
         System.out.println();    
      }   
   }
}

Output

After decrementing each element by 1:
2 0 1 
1 4 8 
5 2 9

Approach-2: By Using User Defined Method

In this approach, matrix elements will be initialized in the program. Then call a user defined method by passing the matrix as parameter and inside method as per the algorithm decrement matrix elements by one.

Example

public class Main{ 
   
   //main method 
   public static void main(String args[]){
      
      //Initialising the matrix  
      int arr[][]={{2,1,9},{5,5,7},{3,6,10}};    
      
      //calling user defined method
      func(arr);
   }
   
   //user defined method
   static void func(int[][] arr){
      
      //creating another matrix to store the addition value   
      int c[][]=new int[3][3]; 
      System.out.println("After decrementing each element by 1:"); 
      
      //addition of element 1 to the matrix    
      for(int i=0;i<3;i++){    
         for(int j=0;j<3;j++){
            c[i][j]+=arr[i][j] - 1;      
            
            //printing the result
            System.out.print(c[i][j]+" ");  
         } 
         
         //new line
         System.out.println();    
      }  
   }
}

Output

After decrementing each element by 1:
1 0 8 
4 4 6 
2 5 9

In this article, we explored different approaches to decrement matrix elements by one by using Java programming language.