设计一个按照时间抽取的基2快速傅里叶变换（基2FFT-DIT）。输入倒位序，输出自然顺序-To design a time of extraction according to the base 2 Fast Fourier Transform (base 2FFT-DIT). Input inversion sequence, the output of natural order。

matlab实现基2fft按时间抽取，输入倒位序，输出顺序 -matlab achieve time-based 2fft extraction, inversion input sequence, output sequence

这是一个自己编写的MATLAB函数，是DFT的快速算法，是一种基于2FFT算法-This is a self-written MATLAB function is fast DFT algorithm, a method based on 2FFT