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sinc函数的FFT问题



我要将一个复数信号和sinc函数进行卷积,然后我想的是分别进行FFT然后相乘。但是对SINC函数进行FFT的时候,输出的数据就出错了,显示1.#QNAN

我完全不知道哪里出错了。。。求帮助,拜托拜托