Find Minimum Elements in Each Row of Matrix in Java?

In Java, Array is an object. It is a non-primitive data type which stores values of similar data type. The matrix in java is nothing but a multi-dimensional array which represents multiple rows and columns.

As per the problem statement we have to find the minimum element present in every row of a given matrix of a multi-dimensional array.

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 = {
   {2, 3,11, 4, 6},
   {21,12,32,45,2},
   {41,12,3,45, 2}
}

The minimum element present in row-0 is 1

The minimum element present in row-1 is 2

The minimum element present in row-2 is 2

Instance-2

Suppose the original matrix is = {
   {2, 3, 1, 4, 6},
   {21, 12, 32, -4, 2},
   {4, 12, 3, 45, 2},
   {-12, -13, 6, 1, 8}
}

The minimum element present in row-0 is 1

The minimum element present in row-1 is -4

The minimum element present in row-2 is 2

The minimum element present in row-3 is -13

Instance-3

Suppose the original matrix is = {
   {2, 3, 1},
   21,12,32},
   {4,12,13}
}

The minimum element present in row-0 is 1

The minimum element present in row-1 is 12

The minimum element present in row-2 is 4

Algorithm

Step 1 − Declare and initialize an integer multi-dimensional array.

Step 2 − Take a loop to iterate the rows of the given matrix.

Step 3 − Inside that loop take another for loop to iterate the columns, by this method we can now check through all the available elements in rows.

Step 4 − We pass those row’s elements in a condition to get the minimum value.

Step 5 − After getting the minimum value in each loop, we print those values as output with its respective row index numbers.

Syntax

To get the length of an array (number of elements in that array), there is an inbuilt property of array i.e length

Below refers to the syntax of it-

array.length

where, ‘array’ refers to the array reference.

Multiple Approaches:

We have provided the solution in different approaches.

• By Using Static Initialization of Array Elements

• By Using User Defined Method

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

Approach-1: By Using Static Initialization of Array Elements

In this approach, array elements will be initialized in the program. Then as per the algorithm the minimum values for each row of the matrix will be printed as output.

Example

public class Main{
   public static void main(String[] args) {
      
      //declare an integer type multi dimentional array
      //here we take a 3X3 Matrix with some random values
      int[][] inputMatrix = {
         {21,34,76},
         {2,1,5},
         {90,23,-23}
      };
      for (int r = 0; r < inputMatrix.length; r++) {
         int minimumValue = inputMatrix[r][0];
         for (int c = 0; c < inputMatrix[r].length; c++){
            
            //if the current index value is smaller than the Minimum value
            if (inputMatrix[r][c] < minimumValue) {
               
               //store the minimum value to the variable each time 
               //when the above condition satisfied
               minimumValue = inputMatrix[r][c];
            }
         }
         
         //print the row index value along with the derived minimum value
         System.out.println("The minimum element present in row-" + r + " is " + minimumValue);
      }
   }
}

Output

The minimum element present in row-0 is 21
The minimum element present in row-1 is 1
The minimum element present in row-2 is -23

Approach-2: By Using User Defined Method

In this approach, array elements will be initialized in the program. Then call a user defined method by passing the array as parameter and inside method as per the algorithm the minimum values for each row of the matrix will be printed as output.

Example

public class Main {
   public static void main(String[] args) {
      
      //declare an integer type multi dimentional array
      //a 3X3 Matrix with some random values
      int[][] inputMatrix ={
         {2, 3, 1}, 
         {21,12,32}, 
         {4,12,3}
      };
     
     //call the user-defined method
      Min(inputMatrix);
   }
   //user defined method
   public static void Min(int[][] mat) {
      for (int r = 0; r < mat.length; r++) {
         int minimumValue = mat[r][0];
         
         //initiate the loop to check through the columns
         for (int c = 0; c < mat[r].length; c++){
           
           //if the current index value is smaller than the Minimum value
            if (mat[r][c] < minimumValue) {
              
               //store the minimum value to the variable each time 
               //when the above condition satisfied
               minimumValue = mat[r][c];
            }
         }
        
         //print the row index value along with the derived minimum value
         System.out.println("The minimum element present in row-" + r + " is " + minimumValue);
      }
   }
}

Output

The minimum element present in row-0 is 1
The minimum element present in row-1 is 12
The minimum element present in row-2 is 3

In this article, we explored different approaches to find the minimum element in each row of a matrix by using Java programming language.