Your work is OK except for the problem that the Fourier transform of cos(2πf0t) does not exist in the usual sense of a function of f, and we have to extend ... ... <看更多>

The standard equations for discrete Fourier transforms (DFTs) involve exponentials to the ... we will express the Fourier transform in terms of sin and cos. ... <看更多>

I am trying to solve Poisson equation in rectangular domain by using Fast Fourier Cosine transform with FFTW3 library. ... <看更多>

Fs = 100; % large frequency to replicate continuous data (dt). t = 0:1/Fs:W-1/Fs;. N = length(t);. x = cos(2*pi*t);. % Fourier transform. f = -10:1/Fs:10;. ... <看更多>