Java Program to Check if it is a Sparse Matrix

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This is the java program to find out a given matrix is sparse matrix or not. Sparse matrix contains zero elements above a certain threshold. This threshold is given by (n*m)/2, where n and m are the rows and columns in matrix. Hence, if a matrix contains more than nm/2 mumber of zeros it is sparse matrix otherwise not.

Here is the source code of the Java Program to Check if it is a Sparse Matrix. The Java program is successfully compiled and run on a Windows system. The program output is also shown below.

  1. //This is a sample program to check whether the matrix is sparse matrix or not
  2. //The complexity of the code is O(n^2)
  3. import java.util.Scanner;
  4.  
  5. public class Sparsity_Matrix 
  6. {
  7.     public static void main(String args[])
  8.     {
  9.         Scanner sc = new Scanner(System.in);
  10.         System.out.println("Enter the dimensions of the matrix: ");
  11.         int m = sc.nextInt();
  12.         int n = sc.nextInt();
  13.         double[][] mat = new double[m][n];
  14.         int zeros = 0;
  15.         System.out.println("Enter the elements of the matrix: ");
  16.         for(int i=0; i<m; i++)
  17.         {
  18.             for(int j=0; j<n; j++)
  19.             {
  20.                 mat[i][j] = sc.nextDouble();
  21.                 if(mat[i][j] == 0)
  22.                 {
  23.                     zeros++;
  24.                 }
  25.             }
  26.         }
  27.  
  28.         if(zeros > (m*n)/2)
  29.         {
  30.             System.out.println("The matrix is a sparse matrix");
  31.         }
  32.         else
  33.         {
  34.             System.out.println("The matrix is not a sparse matrix");
  35.         }
  36.  
  37.         sc.close();
  38.     }
  39. }

Output:

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$ javac Sparsity_matrix.java
$ java Sparsity_matrix
Enter the dimensions of the matrix: 
2 3
Enter the elements of the matrix: 
1 0 0
2 1 1
The matrix is not a sparse matrix
 
$ javac Sparsity_matrix.java
$ java Sparsity_matrix
Enter the dimensions of the matrix: 
3 4
Enter the elements of the matrix: 
1 0 0 0 
0 1 0 0
0 0 1 1
The matrix is a sparse matrix

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn | Youtube | Instagram | Facebook | Twitter