dft.m

来自「the file contain many matlab signal sour」· M 代码 · 共 14 行

function [Xk]=dft(xn,N)
% Computes Discrete Fourier Transform
% --------------
% [Xk]=dft(xn,N)
% Xk=DFT coeff.array over 0<=k<=N-1
% xn=N - point finite - duration sequence
% N=Length of DFT
%
n=[0:1:N-1];
k=[0:1:N-1];
WN=exp(-j*2*pi/N);
nk=n'*k;
WNnk=WN.^nk;
Xk=xn*WNnk;