?? dft.m
字號:
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]; %row vector for n
k=[0:1:N-1]; %row vector for k
WN=exp(-j*2*pi/N); %Wn factor
nk=n'*k; %creates a N by N matrix of nk values
WNnk=WN.^nk; %DFT matrix
Xk=xn*WNnk; %row vector for DFT coefficients
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