fft Class Reference

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

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)

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

• fft.H
• fft.C

Definition at line 51 of file fft.H.

Member Enumeration Documentation

transformDirection

enum transformDirection

Enumerator
FORWARD_TRANSFORM
REVERSE_TRANSFORM

Definition at line 56 of file fft.H.

Member Function Documentation

transform()

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

static

Definition at line 42 of file fft.C.

References Foam::abort(), Foam::endl(), Foam::FatalError, FatalErrorInFunction, Foam::fftRenumber(), forAll, n, Foam::sin(), List::size(), Foam::sqrt(), SWAP, and TWOPI.

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forwardTransform() [1/2]

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

static

Definition at line 187 of file fft.C.

References tmp::clear(), and Foam::transform().

Referenced by Foam::calcEk().

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reverseTransform() [1/2]

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

static

Definition at line 203 of file fft.C.

References tmp::clear(), and Foam::transform().

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

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forwardTransform() [2/2]

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

static

Definition at line 219 of file fft.C.

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

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reverseTransform() [2/2]

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

static

Definition at line 248 of file fft.C.

References tmp::clear(), Foam::component(), and VectorSpace< Vector< scalar >, scalar, 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