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Thread: Java program to do Matrix operation

  1. #1
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    Default Java program to do Matrix operation

    I have an assignment that states:
    2. When you are adding two matrices together, you add similar elements together and place them in a new matrix. Because of this, you need to have matrices with identical sizes. Create a Matrix class, with methods such as add(Matrix a), subtract(Matrix a) and multiplyScalar(double n).

    I have no idea where to start, would anyone be able to help:?


  2. #2
    mmm.. coffee JavaPF's Avatar
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    Default Re: Adding matrices

    Hello saladfingers73 and welcome to the Java Programming Forums

    Do you know anything about Matrix? I suggest you take a look at:

    Getting and Setting Arrays and Their Components (The Java™ Tutorials > The Reflection API > Arrays and Enumerated Types)

    Here is an example of a Matrix:

    class MatrixExample{
     
        public static void main(String[] args)  {
     
        int array[][]= {{1,3,5},{2,4,6}};
        System.out.println("Row size= " + array.length);
        System.out.println("Column size = " + array[1].length);
        outputArray(array);
      }
     
       public static void outputArray(int[][] array) {
     
         int rowSize = array.length;
         int columnSize = array[0].length;
         for(int i = 0; i <= 1; i++) {
           System.out.print("[");
           for(int j = 0; j <= 2; j++) {
             System.out.print(" " + array[i][j]);
           }
           System.out.println(" ]");
         }
         System.out.println();
       }
    }
    See if this helps you and post back if you need help..
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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  3. The Following User Says Thank You to JavaPF For This Useful Post:

    santoshbharat (March 5th, 2012)

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    Default Adding matrices the easy way

    /*
    A Program to add the two matrices
    */
    package com.bharat;
    import java.util.*;
    public class MyNewArrayConcepts {
    public static void main(String[] ar){
    //creating two dimensional arrays
    int[][] arr=new int[3][3];
    int[][] arr1=new int[3][3];
    Scanner sc=new Scanner(System.in);
    System.out.println("Enter elements of first array");
    //accepting the elements for first array by taking the help of scanner object present in java.util
    for(int i=0;i<arr.length;i++){
    for(int j=0;j<arr[i].length;j++){
    arr[i][j]=sc.nextInt();
    }
    }
    //accepting the elements for second array by taking the help of scanner object present in java.util
    System.out.println("Enter elements of Second array");
    for(int i=0;i<arr1.length;i++){
    for(int j=0;j<arr1[i].length;j++){
    arr1[i][j]=sc.nextInt();
    }
    }
    //Displaying the elements of first array in the matrix form(3*3)
    for(int i=0;i<arr.length;i++){
    for(int j=0;j<arr[i].length;j++){
    System.out.print(arr[i][j]+" \t");
    }
    System.out.println();
    }
    System.out.println();
    //Displaying the elements of Second array in the matrix form(3*3)
    for(int i=0;i<arr1.length;i++){
    for(int j=0;j<arr1[i].length;j++){
    System.out.print(arr1[i][j]+" \t");

    }
    System.out.println();
    }
    //Adding the two matrices and Displaying the result of two matrices
    System.out.println("Adding of the matrices");
    for(int i=0;i<arr.length;i++){
    for(int j=0;j<arr[i].length;j++){
    System.out.print(arr[i][j]+arr1[i][j]+" \t");
    }
    System.out.println();
    }
    }
    }

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    Default Re: Adding matrices

    @santoshbharat, why are you resurrecting a post that is over 3 years old. Do you have a question? Is the code you posted meant to spoonfeed a solution?

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    Default Re: Adding matrices

    Quote Originally Posted by copeg View Post
    @santoshbharat, why are you resurrecting a post that is over 3 years old. Do you have a question? Is the code you posted meant to spoonfeed a solution?
    Hey copeg i am sorry man,i am just learning java and figured like posting what i get to write about programming.i know its amateur way of writing.Could you please redesign the code to look better.Thanks in advance

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    Default Re: Adding matrices

    Quote Originally Posted by santoshbharat View Post
    Hey copeg i am sorry man,i am just learning java and figured like posting what i get to write about programming.i know its amateur way of writing.Could you please redesign the code to look better.Thanks in advance
    please read second post of this thread till end.

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