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kharish
code for multiplication of matrix in java using methods
2 Answer(s)      3 years and 8 months ago
Posted in : Java Beginners


code for multiplication of matrix in java using methods


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April 20, 2011 at 10:55 AM


   import java.util.*;
    class MatrixMultiplication{

        public static void main(String[] args){
        Scanner input = new Scanner(System.in);
        int[][] A = new int[3][3];
    int[][] B = new int[3][3];
    int[][] C = new int[3][3];
    System.out.println("Enter elements for matrix A : ");
    for (int i=0 ; i < A.length ; i++)
    for  (int j=0 ; j < A[i].length ; j++){
    A[i][j] = input.nextInt();
    }
    System.out.println("Enter elements for matrix B : ");
    for (int i=0 ; i < B.length ; i++)
    for  (int j=0 ; j < B[i].length ; j++){
    B[i][j] = input.nextInt();
    }
    System.out.println("Matrix A: ");
            for (int i=0 ; i < A.length ; i++){
                System.out.println();
                for  (int j=0 ; j < A[i].length ; j++){
                    System.out.print(A[i][j]+" ");
                      }
            }
    System.out.println();
    System.out.println();
    System.out.println("Matrix B: ");
            for (int i=0 ; i < B.length ; i++){    
                System.out.println();
                for  (int j=0 ; j < B[i].length ; j++){
                    System.out.print(B[i][j]+" ");
                      }
            }
    System.out.println();
    System.out.println();
    System.out.println("Result is: ");
    System.out.println();

    for(int i=0;i<3;i++){
    for(int j=0;j<3;j++){
    for(int k=0;k<3;k++){
    C[i][j]+=A[i][k]*B[k][j];
    }
    }
    }
    for(int i=0;i<3;i++){
    for(int j=0;j<3;j++){
    System.out.print(+C[i][j]+" ");
    }
    System.out.println();
    } 
    }
    }


October 28, 2011 at 10:12 PM


for(int i=0;i<3;i++){ for(int j=0;j<3;j++){ for(int k=0;k<3;k++){ C[i][j]+=A[i][k]*B[k][j]; } } } It is a super formula for Multiplication of matrix

I also did this by using the following code

for(int i=1,c=1,d=1,p=1,o=1;o<=3;o++,++c,++p){ for(int j=1,q=1;j<=3;j++,++q){
z[p][q]=x[c][d]y[i][j]+x[c][d+1]y[i+1][j]+x[c][d+2]*y[i+2][j]; } }

the codeing which I done seems to be more complicated but I did with only two "for loops"



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