ex3021.m

the file contain many matlab signal source code and many example .

L=5;
N=20;
n=1:N;
xn=[ones(1,L),zeros(1,N-L)];
Xk=dfs(xn,N);
magXk=abs([Xk(N/2+1:N) Xk(1:N/2+1)]);
k=[-N/2:N/2];
subplot(211)
stem(n,xn);
subplot(212)
stem(k,magXk);
axis([-N/2,N/2,-0.5,5.5])