Error using plot Vectors must be the same length
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% 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)
f = (-Fs/2:Fs/2-1)/length(s);
size(f)
% Plot two-sided spectrum of S(f)
figure(2);
plot(f, abs(S));
xlabel('Frequency (Hz)');
ylabel('Magnitude');
title('Two-Sided Spectrum of S(f)');
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답변 (1개)
Torsten
2023년 3월 22일
이동: Matt J
2023년 3월 22일
As you can see above, S and f have a different number of elements. So they cannot be plotted against each other.
댓글 수: 2
Matt J
2023년 3월 22일
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)
length(f)
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