Discrete Fourier transform is computed but only for user defined range of frequencies. The time signals and frequencies here are in optical frequency range but can be changed to requirements.
Sathyanarayan Rao (2021). Fourier transform DFT for selected range of frequencies (https://www.mathworks.com/matlabcentral/fileexchange/52685-fourier-transform-dft-for-selected-range-of-frequencies), MATLAB Central File Exchange. Retrieved .
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