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Fourier transformation

fourier.Rd

The fourier operator performs the fourier transformation or the inverse fourier transformation of all input fields. If the number of timesteps is a power of 2 then the algorithm of the Fast Fourier Transformation (FFT) is used. If the input stream infile consists only of complex fields, then the fields of outfile, computed by cdo -f ext fourier,1 -fourier,-1 infile outfile are the same than that of infile. For real input files see function retocomplex.

Usage

cdo_fourier(ifile, epsilon = NULL, ofile = NULL)

Arguments

ifile

String with the path to the input file.

epsilon

INTEGER - -1: forward transformation; 1: backward transformation

ofile

String with the path to the output file.

Note

Complex numbers can only be stored in NetCDF4 and EXTRA format.