功能：采用三峰值法（雨流计数法的一种简化算法）统计应力序列的各循环均值和幅值，输入应力序列，输出各应力循环的幅值和均值

包含内容：计算程序-Using the Rainflow method to count the mean values and ampllitude values of a certain stress process.

Import: stress process

Output: mean values and amplitudes of every cycle