Plotting a fourier transform graph

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Nazarudin Iqzuan Marzulino 2021-1-24

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https://ww2.mathworks.cn/matlabcentral/answers/725742-plotting-a-fourier-transform-graph

评论： Star Strider 2021-1-24

syms t;
f=t*rectangularPulse(t/2);
F=fourier(f);   

Hello, above are the main coding I used for my fourier transform, I'm trying to plot a fourier transform graph, but everytime I tried it either gives a blank graph or sometimes a graph with horizontal line.

I had tried to use plot() and ezplot() but it gives error as I don't have much understanding, I watched youtube videos but still dont understand. I also tried using fplot() but it gives empty graph. I tried a lot of ways through trials and errors but not successful result.

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采纳的回答

Star Strider 2021-1-24

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/725742-plotting-a-fourier-transform-graph#answer_605182

在 MATLAB Online 中打开

Try this:

syms t w 
f(t)=t*rectangularPulse(t/2);
F(w)=fourier(f,t,w);   
figure
fplot(real(F), [-50 50])
hold on
fplot(imag(F), [-50 50])
fplot(abs(F), [-50 50], 'LineWidth',1.5)
hold off
grid
legend('\Re(F)', '\Im(F)', '|F|')

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Nazarudin Iqzuan Marzulino 2021-1-24

Thank you!! Although it seems like a stupid/easy question, but your answer is really beneficial!

Star Strider 2021-1-24

As always, my pleasure!

Thank you!

It was not a ‘stupid’ question by any interpretation, if my clarifying it helped you understand why I wrote my code as I did! That is how we all learn.

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