HELP FOR PROJECT PLEASE

Question

ghaddar karim 2020-5-4

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https://ww2.mathworks.cn/matlabcentral/answers/522995-help-for-project-please

回答： Image Analyst 2020-5-4

hello guys, here i am drawing the Fourier transform of a cos(2*pi*t) but the scale is too big for the figure how can i see the exact form of the graph i apply ylim but it does not show exactly any help please?

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Answer 1

Image Analyst 2020-5-4

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https://ww2.mathworks.cn/matlabcentral/answers/522995-help-for-project-please#answer_430277

在 MATLAB Online 中打开

t = linspace(-3*pi, 3*pi, 1024);
y = cos(2*pi*t);
subplot(3, 1, 1);
plot(t, y, 'b-');
grid on;
title('Original Signal');
% Take FFT
ft = fft(y);
subplot(3, 1, 2);
yft = real(ft);
plot(fftshift(yft), 'b-');
grid on;
title('Real Part of Fourier Transform Signal');
xlim([1, length(t)]);
subplot(3, 1, 3);
semilogy(fftshift(yft), 'b-');
grid on;
title('Real Part of Fourier Transform Signal, Log Plot');
% xlim([1, length(t)]);