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上传相关的程序，求指导！旋转因子和位翻转程序没有错误，一调用fft xx[] 数组的结果为1.#QNAN 困扰一个星期了，拜托各位了
希望这个链接对你有用。
http://processors.wiki.ti.com/index.php/Efficient_FFT_Computation_of_Real_Input
