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I want to mirror my signal over the y axis and make 4 repetitions of it

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Hello
I am trying to show that the frequency specter of a signal repeats itself. I wrote a code which samples a signal and plots its frequency specter, but it only shows the specter from 0 onwards (half the signal), and only 1 repetition.
I wish for it to be symetric over the y axis and repeat itself, something in this style:(pardon my symplisti drawing)
this is my code:
Fs=1e6; %%%% frequency of sampling
t=0:1/Fs:0.001;
f=10000;
x=0.5*(square(2*pi*f*t)+1);
nfft=1024;
X=fft(x,nfft);
X=X(1:nfft/2);
mx=abs(X);
f=(0:nfft/2-1)*Fs/nfft;
subplot(212)
plot(f,mx), title('Freq. Spekter, Fs = 1MHz'), xlabel('frekvenca (Hz)'), ylabel('moč')
grid on
Thanks

Accepted Answer

Prudhvi Peddagoni
Prudhvi Peddagoni on 18 Jan 2021
Hi,
After calling the fft function, you are removing half of the values from variable X. That is the reason you are not seeing symmetry.
Hope this helps.

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