public Matrix mul(Matrix other){
			if(this.getCol() != other.getRow()){
				System.out.print("两个矩阵无法相乘！");
				System.exit(0);
			}
			
			double[][] res = new double[this.getRow()][other.getCol()];
			for(int i=0; i <this.getRow(); i++){
				for(int j=0; j<other.getCol(); j++){
					double item = 0;
					for(int m=0; m<this.getCol(); m++){
						item += this.getValue()[i][m] * other.getValue()[m][j];
					}
					res[i][j] = item;
				}
			}
			
			return new Matrix(res);
		}