Description Usage Arguments Value Author(s) Examples
The Fourier power spectrum of the input field is computed and averaged over shells (bins with width 1) of the modulus of the wavenumber.
1 | fft2d(z)
|
z |
matrix or array of input data with spatial dimensions |
Spectral power (average square of absolute value of spectral
amplitudes) for wavenumbers k=1:(N/2)
.
Jost von Hardenberg, j.vonhardenberg@isac.cnr.it
1 2 3 4 5 6 7 | # Make a synthetic rainfall field with prescribed logarithmic spectral slope
f = initmetagauss(1.7, 64)
r = metagauss(f)
# Check slope of the resulting field
fx <- fft2d(r)
fitslope(fx)
# 1.640373
|
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