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DSPF_sp_fftSPxSP函数的输入个数N不是2的幂该怎么办

dsplib库中的DSPF_sp_fftSPxSP函数的输入个数N不是2的幂,应该怎么操作才能让其输出的值和matlab中的输出是一样的????求指教~~

ps:要是输入个数是2的幂的话,比如512  或者1024个点,确实是跟matlab中是一样的!!!!