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The Procedure Of Multiplying Matrices In Java: Explain In Detail

Referencing Styles : MLA | Pages : 1

Java

Java is a programming language that was created in the year 1995.

Oracle is the owner of Java. There are more than 3billion devices that run Java.

Java is used for various purposes, Such as:

  • Mobile applications
  • Desktop applications
  • Web applications
  • Application servers
  • Web servers
  • Games
  • Database connection

Advantages of using Java

There are certain advantages to using java, such as:

  • Java can work on various platforms including Mac, Raspberry Pi, Windows, Linux, etc.
  • This is one of the most popular programming languages available in the world.
  • Java can be learned very easily and it is also easier to use.

Matrix multiplication

It is very easy to multiply matrices using java. It can be done by using a binary operator (*) and by executing a loop. A matrix can be described as an array of another array. It is easy to add, multiply and even subtract a matrix.

To perform matrix multiplication, one of the elements of a row from the first matrix is multiplied with all the columns of the second matrix.

                           

 Matrix 1                                   

                           

Matrix 2          

                        

                                                

 Matrix 1* Matrix 2              

                                        

 

                                               

Matrix 1 * Matrix 2            

                                                 

Example of the multiplication of two matrices using Java

  1. import java.util.Scanner;
  2. class MatrixMultiplication
  3. {
  4.  public static void main(String args[])
  5.  {
  6.     int m, n, p, q, sum = 0, c, d, k;
  7.     Scanner in = new Scanner(System.in);
  8.     System.out.println("Enter the number of rows and columns of first matrix");
  9.     m = in.nextInt();
  10.     n = in.nextInt();
  11.     int first[][] = new int[m][n];
  12.     System.out.println("Enter elements of first matrix");
  13.     for (c = 0; c < m; c++)
  14.        for (d = 0; d < n; d++)
  15.           first[c][d] = in.nextInt();
  16.     System.out.println("Enter the number of rows and columns of second matrix");
  17.     p = in.nextInt();
  18.     q = in.nextInt();
  19.     if (n != p)
  20.        System.out.println ("The matrices can't be multiplied with each other.");
  21.     else
  22.     {
  23.        int second[][] = new int[p][q];
  24.        int multiply[][] = new int[m][q];
  25.        System.out.println("Enter elements of second matrix");
  26.        for (c = 0; c < p; c++)
  27.           for (d = 0; d < q; d++)
  28.              second[c][d] = in.nextInt();
  29.        for (c = 0; c < m; c++)
  30.        {
  31.           for (d = 0; d < q; d++)
  32.           {  
  33.              for (k = 0; k < p; k++)
  34.              {
  35.                 sum = sum + first[c][k]*second[k][d];
  36.              }
  37.              multiply[c][d] = sum;
  38.              sum = 0;
  39.           }
  40.        }
  41.        System.out.println("Product of the matrices:");
  42.        for (c = 0; c < m; c++)
  43.        {
  44.           for (d = 0; d < q; d++)
  45.              System.out.print(multiply[c][d]+"\t");
  46.           System.out.print("\n");
  47.        }
  48.     }
  49.  }
  50. }

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