中文说明：
用fft算法求信号函数的相位或相位差，发现一些规律，对正弦、余弦函数而言，所得结果，有差异。
English Description：
FFT algorithm is used to find the phase or phase difference of signal function, and some rules are found. For sine and cosine functions, the results are different.
Using FFT algorithm to find the phase or phase difference of signal function
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中文说明：
用fft算法求信号函数的相位或相位差，发现一些规律，对正弦、余弦函数而言，所得结果，有差异。
English Description：
FFT algorithm is used to find the phase or phase difference of signal function, and some rules are found. For sine and cosine functions, the results are different.
fft0.m