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>

In order to check my code, as you can see, I tried to compute the discrete time Fourier transform of cos(n) by sampling it and comparing it ... ... <看更多>

s_a: Fourier transform internal cos. In mrc-ide/umbrella: Rainfall & seasonality. Description Usage Arguments Value. View source: R/fourier. ... <看更多>