说明：  迭代法是解各种方程(含方程组)的基本方法, 它常通过构造一个定常的迭代格式，重复计算而产生一个收敛的解的序列（标量序列，向量序列等），逐步逼近问题的真解。
(Iterative method is the solution of various equations (including equations) of the basic method, it is often by constructing a stationary iterative format, double counting arising from a converged solution sequence (scalar sequences, vector sequences, etc.), gradually approaching the problem really solution.)