“离散傅里叶变换的MATLAB实现”一节里介绍的方法，编写MATLAB函数分别用来计算有限序列的DFT和IDFT 掌握序列DFT的分析方法-" MATLAB implementation of Discrete Fourier Transform," a descr iption of the method in the preparation of MATLAB functions were used to calculate a finite sequence of DFT

matlab用DFT矩阵形式实现的DFT函数与IDFT函数(using MATLAB to realize a DFT function in DFT's definition.)