How to create a matrix in R

How to read a Matrix from user in Java?

Last Updated : 05 Mar, 2019

Given task is to read a matrix from the user. The size and number of elements of matrices are to be read from the keyboard.

// Java program to read a matrix from user 
  
import java.util.Scanner; 
  
public class MatrixFromUser { 
  
    // Function to read matrix 
    public static void readMatrixByUser() 
    { 
        int m, n, i, j; 
        Scanner in = null; 
        try { 
            in = new Scanner(System.in); 
            System.out.println("Enter the number "
                               + "of rows of the matrix"); 
            m = in.nextInt(); 
            System.out.println("Enter the number "
                               + "of columns of the matrix"); 
            n = in.nextInt(); 
  
            // Declare the matrix 
            int first[][] = new int[m][n]; 
  
            // Read the matrix values 
            System.out.println("Enter the elements of the matrix"); 
            for (i = 0; i < m; i++) 
                for (j = 0; j < n; j++) 
                    first[i][j] = in.nextInt(); 
  
            // Display the elements of the matrix 
            System.out.println("Elements of the matrix are"); 
            for (i = 0; i < m; i++) { 
                for (j = 0; j < n; j++) 
                    System.out.print(first[i][j] + "  "); 
                System.out.println(); 
            } 
        } 
        catch (Exception e) { 
        } 
        finally { 
            in.close(); 
        } 
    } 
  
    // Driver code 
    public static void main(String[] args) 
    { 
        readMatrixByUser(); 
    } 
} 

Output:

Enter the number of rows of the matrix 2
Enter the number of columns of the matrix 2
Enter the elements of the matrix
1
2
3
4
Elements of the matrix are
1 2 
3 4

How to create a matrix in R

D

DeepakRathi

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Article Tags :

Java

Practice Tags :

Java

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