public MyJavaArrey MulColumnWize (MyJavaArrey a)   {

    		

    		

    		

    		int i,j;

    		

    		if (this.y != a.x) {

    			return null;

    		}

    		

    		double [][] mulrow = new double[this.x][a.y];

    		for (j=0; j<a.y; j++)     {

    			for (i=0; i<this.x; i++)    {

    				mulrow[i][j] = Ginomeno(a,i,j);

    			}	

    		}

    		this.pinakas=mulrow;

    		return this;	

}



private double Ginomeno (MyJavaArrey a, int grammi, int stili)  {

    	double sum=0;

    	int i,j;

    	

    	for (i=0; i<this.y; i++)  {

    		sum = sum + this.pinakas[grammi][i]*a.pinakas[i][stili];

    	}

    	return sum;

}