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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