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src
randomProcesses
fft
fft.H
Go to the documentation of this file.
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/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright (C) 1991-2010 OpenCFD Ltd.
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software: you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
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Class
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Foam::fft
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Description
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Fast fourier transform derived from the Numerical
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Recipes in C routine.
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The complex transform field is returned in the field supplied. The
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direction of transform is supplied as an argument (1 = forward, -1 =
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reverse). The dimensionality and organisation of the array of values
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in space is supplied in the nn indexing array.
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SourceFiles
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fft.C
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\*---------------------------------------------------------------------------*/
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#ifndef fft_H
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#define fft_H
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#include <
OpenFOAM/complexFields.H
>
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#include <
OpenFOAM/labelList.H
>
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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namespace
Foam
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{
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class
fft
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{
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public
:
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enum
transformDirection
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{
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FORWARD_TRANSFORM
= 1,
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REVERSE_TRANSFORM
= -1
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};
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static
void
transform
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(
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complexField
& field,
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const
labelList
& nn,
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transformDirection
fftDirection
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);
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static
tmp<complexField>
forwardTransform
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(
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const
tmp<complexField>
& field,
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const
labelList
& nn
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);
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static
tmp<complexField>
reverseTransform
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(
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const
tmp<complexField>
& field,
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const
labelList
& nn
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);
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static
tmp<complexVectorField>
forwardTransform
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(
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const
tmp<complexVectorField>
& field,
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const
labelList
& nn
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);
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static
tmp<complexVectorField>
reverseTransform
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(
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const
tmp<complexVectorField>
& field,
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const
labelList
& nn
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);
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};
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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}
// End namespace Foam
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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#endif
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// ************************ vim: set sw=4 sts=4 et: ************************ //