What is the code for generating X(k) from given X(n) = [1 2 3 4] using Fast Fourier Transform?

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Sentia Arianti 2021-7-5

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https://ww2.mathworks.cn/matlabcentral/answers/871958-what-is-the-code-for-generating-x-k-from-given-x-n-1-2-3-4-using-fast-fourier-transform

评论： Sentia Arianti 2021-7-5

There is this sequen of X(n) = [1 2 3 4] how do i get the X(k) using FFT function? What is the code for the function? And also the code for IFFT. Thank you

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Chunru 2021-7-5

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https://ww2.mathworks.cn/matlabcentral/answers/871958-what-is-the-code-for-generating-x-k-from-given-x-n-1-2-3-4-using-fast-fourier-transform#answer_740033

在 MATLAB Online 中打开

x = [1 2 3 4];
xfft = fft(x)
xfft = 
  10.0000 + 0.0000i  -2.0000 + 2.0000i  -2.0000 + 0.0000i  -2.0000 - 2.0000i
y = ifft(xfft)
y = 1×4
     1     2     3     4