这是一个求非线性方程一个实根的牛顿法，函数返回标志值。若返回的标志值大于等于0则表示正常返回-This is a nonlinear equation for a real root of the Newton method, function return value signs. If the sign of the return value greater than or equal to 0 that the normal return

不动点方程法，解决隐马尔科夫过程的熵率计算问题，二元对称信道-Fixed point equation method to solve the entropy rate of the Hidden Markov Models computational problems, binary symmetric channel