FFT of a summation

Hello, Attached is a summation function that I am using a FOR loop to implement. I am trying to get the FFT of that function. Attached is an image of what the FFT should look like. Can someone help, please? Thanks!

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Answer 1

[Darshan Ramakant Bhat]

To calculate fft the signal should be discrete. You should first sample your signal. Use t=nTs, where Ts is the sampling time. Calculate X(n) for n=1:N, where N is required number of samples. Then you can give this array to fft function.

I have attached a sample script of the same.You can tune the parameters to get the required spectrum. Please have a look at the following documentation for more details.

https://www.mathworks.com/help/matlab/ref/fftshift.html