fft Class Reference

Fast fourier transform derived from the Numerical Recipes in C routine. More...

#include <randomProcesses/fft.H>

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Detailed Description

Fast fourier transform derived from the Numerical Recipes in C routine.

The complex transform field is returned in the field supplied. The direction of transform is supplied as an argument (1 = forward, -1 = reverse). The dimensionality and organisation of the array of values in space is supplied in the nn indexing array.

Source files

• src/randomProcesses/fft/fft.H
• src/randomProcesses/fft/fft.C

Definition at line 52 of file fft.H.

List of all members.

Public Types
enum	transformDirection { FORWARD_TRANSFORM = 1, REVERSE_TRANSFORM = -1 }
Static Public Member Functions
static void	transform (complexField &field, const labelList &nn, transformDirection fftDirection)
static tmp< complexField >	forwardTransform (const tmp< complexField > &field, const labelList &nn)
static tmp< complexField >	reverseTransform (const tmp< complexField > &field, const labelList &nn)
static tmp< complexVectorField >	forwardTransform (const tmp< complexVectorField > &field, const labelList &nn)
static tmp< complexVectorField >	reverseTransform (const tmp< complexVectorField > &field, const labelList &nn)

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Member Enumeration Documentation

enum transformDirection

Enumerator:

FORWARD_TRANSFORM
REVERSE_TRANSFORM

Definition at line 57 of file fft.H.

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Member Function Documentation

void transform	(	complexField &	field,
		const labelList &	nn,
		transformDirection	fftDirection
	)		[static]

Definition at line 42 of file fft.C.

References Foam::abort(), UList< T >::begin(), Foam::endl(), Foam::FatalError, FatalErrorIn, Foam::fftRenumber(), forAll, Foam::sin(), List< T >::size(), Foam::sqrt(), SWAP, and TWOPI.

tmp< complexField > forwardTransform	(	const tmp< complexField > &	field,
		const labelList &	nn
	)		[static]

Definition at line 190 of file fft.C.

References tmp< T >::clear(), and Foam::transform().

Referenced by Foam::calcEk().

tmp< complexField > reverseTransform	(	const tmp< complexField > &	field,
		const labelList &	nn
	)		[static]

Definition at line 206 of file fft.C.

References tmp< T >::clear(), and Foam::transform().

Referenced by noiseFFT::Pf(), and turbGen::U().

tmp< complexVectorField > forwardTransform	(	const tmp< complexVectorField > &	field,
		const labelList &	nn
	)		[static]

Definition at line 222 of file fft.C.

References tmp< T >::clear(), Foam::component(), and VectorSpace< Vector< Cmpt >, Cmpt, 3 >::nComponents.

tmp< complexVectorField > reverseTransform	(	const tmp< complexVectorField > &	field,
		const labelList &	nn
	)		[static]

Definition at line 251 of file fft.C.

References tmp< T >::clear(), Foam::component(), and VectorSpace< Vector< Cmpt >, Cmpt, 3 >::nComponents.

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The documentation for this class was generated from the following files:

• src/randomProcesses/fft/fft.H
• src/randomProcesses/fft/fft.C