a37.m

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

n=-10:10;
x=2.^(n-1);
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,magX);
grid on
subplot(212)
plot(w,angX);
grid on