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关于C66x FFT库函数DSPF_sp_fftSPxSP()运算结果和matlab不一样的问题

当输入的复数的实部和虚部都存在时两者的结果相差甚远,当实部为0或者虚部为0时,结果基本一样(有效数字最后一位不一样,精度问题),求大神解惑