exp5.m

用MATLAB编写的FFT程序

t=0:0.001:1;
x=sin(2*pi*100*t)+sin(2*pi*200*t)+rand(size(t));
subplot(2,1,1);
plot(x(1:50));
Y=fft(x,512);
f=1000*(0:256)/512;
subplot(2,1,2);
plot(f,Y(1:257));