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每次处理结果为什么不一样?

在一个任务里,首先产生一个线性调频信号,然后进行FFT变换,然后取模值,暂停后对处理结果进行画图,我发现第一次运行结果正确,再次运行(重新产生信号,进行FFT变换,再取模值),结果就不对了,为什么呀?