幂法: 程序中把循环变量定义为循环20次，同样可以更改 示例 矩阵: 1.0 1.0 0.5 1.0 1.0 0.25 0.5 0.25 2.0 初值(1 1 1)T-Power Method: The procedure in the definition of the cycle variables for the cycle 20 times, also can change the sample matrix: 1.0 1.0 0