fourier: Fourier transformation

In rcdo: Wrapper of 'CDO' Operators

Fourier transformation

Description

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.

Value

Operators that output one or more files return a character vector to the output files.

Operators that output an indefinite number of files return a string with the basename of the files.

Operatos that don't return filenames return a character vector with the string output.

Note

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

rcdo documentation built on June 8, 2025, 12:36 p.m.