a30.m

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

subplot(311)
N=50;
n=0:N-1;t=0.01*n;
x=5*sin(4*pi*t)+3*cos(2*pi*t);
plot(n,x)
y=fft(x,N)
subplot(312)
plot(n,abs(y))
subplot(313)
N=60;n=0:N-1;t=0.01*n;
q=n*2*pi/N;
x=5*sin(4*pi*t)+3*cos(2*pi*t);
y=fft(x,N);
plot(n,abs(y))