a31.m

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

n=-5:5;
x=2.^n;
k=-200:200;
w=(pi/100)*k;
X=x*(exp(-j*pi/100)).^(n'*k);
magX=abs(X);
angX=angle(X);
subplot(211)
plot(w/pi,magX);grid on
subplot(212)
plot(w/pi,angX);grid on