dftgrid {cooltools} | R Documentation |
Produce coordinates for Discrete Fourier Transform
Description
Produces the direct space coordinates (x) and Fourier space frequencies (f) and angular frequencies (k), corresponding to the Discrete Fourier Transform dft
of this package.
Usage
dftgrid(N, L, x0 = 0, k0 = -floor(N/2) * 2 * pi/L)
Arguments
N |
number of divisions along one dimension used in direct and Fourier space |
L |
side-length (=period) of the data long one dimension |
x0 |
zero-point of x-coordinates (=0 in most applications) |
k0 |
zero-point of k-coordinates (=0 or -floor(N/2)*dk in most applications) |
Value
Returns a list with:
x |
vector of direct space coordinates |
f |
vector of Fourier space coordinates (frequencies) |
k |
vector of Fourier space coordinates (angular frequencies) |
dx |
spacing of x-values |
df |
spacing of f-values |
dk |
spacing of k-values |
L |
input value of L |
N |
input value of N |
Author(s)
Danail Obreschkow
[Package cooltools version 2.4 Index]