MathrixMult.java

 public matrix mul(matrix B)
 {
	// Return a new matrix which is the matrix product of this
	// with B.
	if((rows()!=B.rows()) || (cols()!=B.cols())) 
	{
       		System.out.println("Error, cannot add since the 2 matrices do not have the same dimensions.");
       		System.exit(0);
       	}
 	matrix M = new matrix(rows(), cols());

    	for(int i = 1; i <= rows(); i++) 
		for(int j = 1; j <= B.cols(); j++) 
       			for(int k = 0; k < cols(); k++) 
       				M.set(i,j, M.get(i,j) + get(i,k) * B.get(k,j));
	return M;
}