如题所述
N=10;
n=0:1:N-1;
x1=(0.8).^n;
k=0:1:N-1;
WN=exp(-j*2*pi/N);
nk=n'*k;
WNnk=WN.^nk;
Xk=x1*WNnk;
subplot(2,1,1)
stem(n,x1);
subplot(2,1,2)
stem(k,abs(Xk));