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vlfft例程中基4FFT和混合基FFT的问题

工程师你好:

使用vlfft的例程,感觉DSPF_sp_mixedRadix_fftSPxSP,DSPF_sp_radix4_fftSPxSP两个FFT函数的输出结果不对,与Matlab相比较,发现FFT输出的点数是按照

0,N,N-1,N-2,……,3,2,1的顺序输出的,这是什么原因?是例程本身有问题吗?