中文说明：
应用FFT方法计算时间序列平均周期的源码。不是很复杂，不过效果比较好。
English Description：
FFT method is used to calculate the average period of time series. It's not very complicated, but the effect is better.
FFT method to calculate the average period of time series source code
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中文说明：
应用FFT方法计算时间序列平均周期的源码。不是很复杂，不过效果比较好。
English Description：
FFT method is used to calculate the average period of time series. It's not very complicated, but the effect is better.
FFTcircle.m