Matrix Operation

Add

public class MatrixAdd {
    static void Matrixadd(double a[][],double b[][],double c[][],int m,int n)
    {
        int i,j;
        for(i=0;i<m;i++)
            for(j=0;j<n;j++)
            {
                c[i][j]=a[i][j]+b[i][j];
            }       
    }
    public static void main(String[] args)
    {
        double a[][]= {
                {1.0,2.0,3.0},
                {4.0,5.0,6.0},
                {7.0,8.0,9.0}
        };
        double b[][]= {
                {6.0,3.0,7.0},
                {9.0,2.0,6.0},
                {4.0,3.0,9.0}
        };
        double[][] c=new double [3][3];
        int m,n,i,j;
        m=n=3;
        System.out.println("the result of matrix plus is : ");
        Matrixadd(a,b,c,m,n);
        for(i=0;i<m;i++)
        {
            for(j=0;j<n;j++)
            {
                System.out.printf("%10.6f", c[i][j]);
            }
            System.out.print("\n");
        }
    }
}

Minus

    static void MatrixMinus(double a[][],double b[][],double c[][],int m,int n)
    {
        int i,j;
        for(i=0;i<m;i++)
            for(j=0;j<n;j++)
            {
                c[i][j]=a[i][j]-b[i][j];
            }       
    }

Multiply

public class MatrixMul {
    static void matrixMul(double a[][],double b[][],double c[][],int m,int n,int k)
    {
        int i,j,l;
        for(i=0;i<m;i++)
        {
            for(j=0;j<n;j++)
            {
                c[i][j]=0;
                for(l=0;l<k;l++)
                {
                    c[i][j] +=(a[i][l]*b[l][j]);
                }
            }
        }
    }

    public static void main(String[] args)
    {
        double a[][]= {
                {1.0,2.0,3.0},
                {4.0,5.0,6.0},
                {7.0,8.0,9.0}
        };
        double b[][]= {
                {6.0,3.0,7.0},
                {9.0,2.0,6.0},
                {4.0,3.0,9.0}
        };
        double[][] c=new double [3][3];
        int m,n,k,i,j;
        m=n=k=3;
        System.out.println("the result of matrix plus is : ");
        matrixMul(a,b,c,m,n,k);
        for(i=0;i<m;i++)
        {
            for(j=0;j<n;j++)
            {
                System.out.printf("%10.6f", c[i][j]);
            }
            System.out.print("\n");
        }
    }
}