Error using plot Vectors must be the same length

2 vues (au cours des 30 derniers jours)
Ha
Ha le 22 Mar 2023
Commenté : Matt J le 22 Mar 2023
% Define time range
t = -0.2:0.0001:0.2;
% Calculate signal s(t)
s = cos(2*pi*10*t).*cos(27*pi*200*t);
% Plot s(t)
figure(1);
plot(t, s);
xlabel('Time (s)');
ylabel('Amplitude');
title('AM Modulated Signal s(t)');
% Calculate Fourier transform of s(t)
Fs = 10000; % Sampling frequency
S = fftshift(fft(s))/length(s);
size(S)
ans = 1×2
1 4001
f = (-Fs/2:Fs/2-1)/length(s);
size(f)
ans = 1×2
1 10000
% Plot two-sided spectrum of S(f)
figure(2);
plot(f, abs(S));
Error using plot
Vectors must be the same length.
xlabel('Frequency (Hz)');
ylabel('Magnitude');
title('Two-Sided Spectrum of S(f)');

Réponses (1)

Torsten
Torsten le 22 Mar 2023
Déplacé(e) : Matt J le 22 Mar 2023
As you can see above, S and f have a different number of elements. So they cannot be plotted against each other.
  2 commentaires
Ha
Ha le 22 Mar 2023
I didn't understand what you mean..but what is wrong with the code? .. As for S.f, they have the same number of elements as shown in the code. Can the problem be solved?
Matt J
Matt J le 22 Mar 2023
As for S.f, they have the same number of elements as shown in the code.
It is puzzling that you think so. Running the code clearly shows that length(S)=4001 while length(f)=10000
% Define time range
t = -0.2:0.0001:0.2;
% Calculate signal s(t)
s = cos(2*pi*10*t).*cos(27*pi*200*t);
% Calculate Fourier transform of s(t)
Fs = 10000; % Sampling frequency
S = fftshift(fft(s))/length(s);
f = (-Fs/2:Fs/2-1)/length(s);
length(S)
ans = 4001
length(f)
ans = 10000

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