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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2011-2024 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
OpenFOAM is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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for more details.
You should have received a copy of the GNU General Public License
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Global
fftRenumber
Description
Multi-dimensional renumbering used in the Numerical Recipes
fft routine.
SourceFiles
fftRenumber.C
\*---------------------------------------------------------------------------*/
#ifndef fftRenumber_H
#define fftRenumber_H
#include "complex.H"
#include "List.H"
#include "labelList.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
// Recursively evaluate the indexing necessary to do the folding of the fft
// data. We recurse until we have the indexing necessary for the folding in all
// directions.
void fftRenumberRecurse
(
List<complex>& data,
List<complex>& renumData,
const labelList& nn,
label nnprod,
label ii,
label l1,
label l2
);
// Fold the n-d data array to get the fft components in the right places.
void fftRenumber
(
List<complex>& data,
const labelList& nn
);
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //
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