ezfftf, ezfftb
Functions for computing Fourier coefficients of a real
periodic sequence (Fourier analysis) and vice versa.
Synopsis
function ezfftf(
x[*] : float
)
function ezfftb(
cf[2][*] : float,
xbar[1] : float
)
Arguments
- x
- periodic sequence to be transformed (1D array of length npts where
npts need not be a power of 2)
- cf
- fourier coefficients (2D array dimensioned 2 x (npts/2)+1)
- xbar
- constant fourier coefficient
Description
Given periodic sequence x, ezfftf computes its
Fourier coefficients and returns it as a 2D float array dimensioned 2
x (npts/2)+1. It also returns the constant Fourier
coefficient xbar as an attribute of cf.
Given Fourier coefficients cf and constant Fourier
coefficient xbar, ezfftb computes the periodic
sequences and returns a 1D float array of length npts.
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$Revision: 1.5 $ $Date: 1998/11/11 23:32:17 $