Plot the regular function and Fourier transform

Question

Tu Nguyen 2022-2-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1660445-plot-the-regular-function-and-fourier-transform

回答： Benjamin Thompson 2022-2-28

采纳的回答： Benjamin Thompson

imaging 1.png

syms x a b L

n = [-10:0.01:10];

f = inline('rectangularPulse(a,b,x)','x')

f_FT = (1/L)*fourier(f);

Hi guys, I am confused about this assignment, I choose the rect function and transfer to its Fourier transform, but I am confused about the variable, my professor want the plot x over y, not the time. So, in this case, I change x to n/L and plot on interval (-10, 10) correct?

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Answer 1

Benjamin Thompson 2022-2-28

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https://ww2.mathworks.cn/matlabcentral/answers/1660445-plot-the-regular-function-and-fourier-transform#answer_906460

y for the first plot would be the rectangular pulse value. x would be the range -10 to 10. For the plot of the fourier transform, the y would be the magnitude of the fourier transform output, the x values may be arbitrary. They want to show the important details so you may need to experiment with different frequency ranges for that plot to see what makes sense.