fs = 20;
Ts = 1/fs
L = 10- Ts;
t = 0:Ts:L;


f = zeros(1,200);
f(1:100) = 2;
f(101:200) = 5;
signal = sin(2*pi*f.*t);
N = length(signal);


XRozsah = abs(fftshift(fft(signal)));
BinOsa = [0 : N-1];
N_2 = ceil(N/2);
FOsa= (BinOsa-N_2)*fs/N;
title("Graf")
subplot(2,1,1)

plot(FOsa, XRozsah)
xlabel('Frekvence(Hz)');
ylabel('Rozsah');
title('Dvoustranne frekvensni spektrum');
axis tight
subplot(2,1,2)
plot(t,signal)
xlabel('Cas');
ylabel('Amplituda');
title("Casova oblast")