Fourierova trans. matlab

[Eduard]

Zdravim,
nejak takto? Je tam iba jednoduchy nezasumeny signal. Drzim palce


clc;clear all;
x=0:0.01:4;
dx=mean(diff(x));
y=sin(2*pi*x*7)+sin(2*pi*x*12);
f=fftshift(fft(y));
nn=length(x);
dw=1/dx/nn;
w=dw*(-floor(nn/2):1:floor(nn/2));
plot(w,abs(f))
xlabel('w')
figure(2)
plot(w(floor(nn/2):end),abs(f(floor(nn/2):end)))
xlabel('w')