How can I draw a Frequency-Domain?

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mohammad heydari
mohammad heydari on 27 Aug 2021
Edited: mohammad heydari on 13 Sep 2021
Hi,
I encounter the problem of transforming a shape from the time domain to the frequency domain.
I used the following commands to convert Fourier.
n1=8;
n2=72;
nt=25501;
dt=1.176470588235294e-13;
F=zeros(n1+n2+2,nt);
F1=F(n1+n2,:);
F2 = fftshift(fft(F1));
f=linspace(-10,10,length(F2));
figure(1);
plot(f, 10*log10(abs(F2)))
Please do not doubt the values entered such as 'nt' and 'dt' because all the shapes obtained in the time domain are correct and the only problem is in converting the frequency.
Let me know please.
Thank you.

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